System.Collections.Generic.IEnumerable.Aggregate(TAccumulate, System.Func, System.Func)

public static SslProtocols Parse(string protocols, SslProtocols defaultSslProtocols, ILogger logger)
        {
            if (string.IsNullOrEmpty(protocols))
            {
                return defaultSslProtocols;
            }

            var sslProtocols = new List<SslProtocols>();
            foreach (string protocolString in protocols.Split(',').Select(s => s.Trim()))
            {
                if (!TryParseProtocol(protocolString, out SslProtocols sslProtocol))
                {
                    logger?.LogWarning($"Unable to parse SSLProtocol {protocolString}");
                }
                else
                {
                    sslProtocols.Add(sslProtocol);
                }
            }

            if (sslProtocols.Count == 0)
            {
                return defaultSslProtocols;
            }

            return sslProtocols.Aggregate(SslProtocols.None, (current, bt) => current | bt);
        }

public static string GetQuery(this IEnumerable<IExpression> items)
        {
            return items.Select(x => x.Query).Aggregate((x, y) => $"{x},{y}");
        }

public virtual Action<IAppBuilder> Load(string appName, IList<string> errors)
        {
            Func<string, IList<string>, Action<IAppBuilder>> chain = _providers.Aggregate(
                (Func<string, IList<string>, Action<IAppBuilder>>)((arg, arg2) => null),
                (next, provider) => provider.Create(next));

            return chain.Invoke(appName, errors);
        }

private static IQueryable<TData> GetDataQuery<TModel, TData>(this IQueryable<TData> query, IMapper mapper,
            Expression<Func<TModel, bool>> filter = null,
            Expression<Func<IQueryable<TModel>, IQueryable<TModel>>> queryFunc = null,
            IEnumerable<Expression<Func<TModel, object>>> includeProperties = null)
        {
            Expression<Func<TData, bool>> f = mapper.MapExpression<Expression<Func<TData, bool>>>(filter);
            Func<IQueryable<TData>, IQueryable<TData>> mappedQueryFunc = mapper.MapExpression<Expression<Func<IQueryable<TData>, IQueryable<TData>>>>(queryFunc)?.Compile();
            ICollection<Expression<Func<TData, object>>> includes = mapper.MapIncludesList<Expression<Func<TData, object>>>(includeProperties);

            if (filter != null)
                query = query.Where(f);

            if (includes != null)
                query = includes.Aggregate(query, (q, next) => q.Include(next));

            return mappedQueryFunc != null ? mappedQueryFunc(query) : query;
        }

private Expression ConvertDestinationExpressionToSourceExpression(Expression expression)
        {
            // call beforevisitors
            expression = _beforeVisitors.Aggregate(expression, (current, before) => before.Visit(current));

            var typeMap = _mapper.ConfigurationProvider.Internal().ResolveTypeMap(typeof(TDestination), typeof(TSource));
            var visitor = new ExpressionMapper.MappingVisitor(_mapper.ConfigurationProvider, typeMap, _destQuery.Expression, _dataSource.Expression, null,
                new[] { typeof(TSource) });
            var sourceExpression = visitor.Visit(expression);

            // apply parameters
            if (_parameters != null && _parameters.Any())
            {
                var constantVisitor = new ConstantExpressionReplacementVisitor(_parameters);
                sourceExpression = constantVisitor.Visit(sourceExpression);
            }

            // apply null guards in case the feature is enabled
            if (_mapper.ConfigurationProvider.Internal().EnableNullPropagationForQueryMapping)
            {
                var nullGuardVisitor = new NullsafeQueryRewriter();
                sourceExpression = nullGuardVisitor.Visit(sourceExpression);
            }
            // call aftervisitors
            sourceExpression = _afterVisitors.Aggregate(sourceExpression, (current, after) => after.Visit(current));

            return sourceExpression;
        }

public static double VarP(IEnumerable<double> args)
        {
            double avg = args.Select(x => (double)x).Average();
            double d = args.Aggregate(0.0, (total, next) => total += System.Math.Pow(next - avg, 2));
            return Divide(d, args.Count()); 
        }

public static ISpecification<TEnreplacedy> All(params ISpecification<TEnreplacedy>[] specifications)
        {
            return specifications.Aggregate(New(), (current, specification) => current.And(specification));
        }

protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
        {
            var headers = request.Headers as IEnumerable<KeyValuePair<string, IEnumerable<string>>>;
            var ms = new MemoryStream();

            if (request.Content != null)
            {
                await request.Content.CopyToAsync(ms).ConfigureAwait(false);
                headers = headers.Union(request.Content.Headers).ToArray();
            }

            // Add Cookie Header if any cookie for the domain in the cookie store
            var stringBuilder = new StringBuilder();

            var cookies = NSHttpCookieStorage.SharedStorage.Cookies
                                             .Where(c => c.Domain == request.RequestUri.Host)
                                             .Where(c => Utility.PathMatches(request.RequestUri.AbsolutePath, c.Path))
                                             .ToList();
            foreach (var cookie in cookies)
            {
                stringBuilder.Append(cookie.Name + "=" + cookie.Value + ";");
            }

            var rq = new NSMutableUrlRequest()
            {
                AllowsCellularAccess = true,
                Body = NSData.FromArray(ms.ToArray()),
                CachePolicy = (!this.DisableCaching ? NSUrlRequestCachePolicy.UseProtocolCachePolicy : NSUrlRequestCachePolicy.ReloadIgnoringCacheData),
                Headers = headers.Aggregate(new NSMutableDictionary(), (acc, x) => {

                    if (x.Key == "Cookie")
                    {
                        foreach (var val in x.Value)
                            stringBuilder.Append(val + ";");
                    }
                    else
                    {
                        acc.Add(new NSString(x.Key), new NSString(String.Join(getHeaderSeparator(x.Key), x.Value)));
                    }

                    return acc;
                }),
                HttpMethod = request.Method.ToString().ToUpperInvariant(),
                Url = NSUrl.FromString(request.RequestUri.AbsoluteUri),
            };

            if (stringBuilder.Length > 0)
            {
                var copy = new NSMutableDictionary(rq.Headers);
                copy.Add(new NSString("Cookie"), new NSString(stringBuilder.ToString().TrimEnd(';')));
                rq.Headers = copy;
            }

            if (Timeout != null)
                rq.TimeoutInterval = Timeout.Value.TotalSeconds;

            var op = session.CreateDataTask(rq);

            cancellationToken.ThrowIfCancellationRequested();

            var ret = new TaskCompletionSource<HttpResponseMessage>();
            cancellationToken.Register(() => ret.TrySetCanceled());

            lock (inflightRequests)
            {
                inflightRequests[op] = new InflightOperation()
                {
                    FutureResponse = ret,
                    Request = request,
                    Progress = getAndRemoveCallbackFromRegister(request),
                    ResponseBody = new ByteArrayListStream(),
                    CancellationToken = cancellationToken,
                };
            }

            op.Resume();
            return await ret.Task.ConfigureAwait(false);
        }

public static Parser<TToken, T> Build<TToken, T>(
            Parser<TToken, T> term,
            IEnumerable<OperatorTableRow<TToken, T>> operatorTable
        ) => operatorTable.Aggregate(term, Build);

public ExternalTaskDelegate Build(ExternalTaskDelegate lastDelegate)
        {
            Guard.NotNull(lastDelegate, nameof(lastDelegate));

            return _middlewareList.Reverse()
                .Aggregate(lastDelegate, (current, middleware) => middleware(current));
        }

private static List<List<ODataExpansionOptions>> GetExpansions(this IEnumerable<Selecreplacedem> selectedItems, HashSet<string> selects, Type parentType)
        {
            if (selectedItems == null)
                return new List<List<ODataExpansionOptions>>();

            return selectedItems.OfType<ExpandedNavigationSelecreplacedem>().Aggregate(new List<List<ODataExpansionOptions>>(), (listOfExpansionLists, next) =>
            {
                string path = next.PathToNavigationProperty.FirstSegment.Identifier;//Only first segment is necessary because of the new syntax $expand=Builder($expand=City) vs $expand=Builder/City

                if (!selects.ExpansionIsValid(path))/*If selects are defined then check to make sure the expansion is one of them.*/
                    return listOfExpansionLists;

                Type currentParentType = parentType.GetCurrentType();
                Type memberType = currentParentType.GetMemberInfo(path).GetMemberType();
                Type elementType = memberType.GetCurrentType();

                ODataExpansionOptions exp = new ODataExpansionOptions
                {
                    MemberType = memberType,
                    ParentType = currentParentType,
                    MemberName = path,
                    FilterOptions = GetFilter(),
                    QueryOptions = GetQuery(),
                    Selects = next.SelectAndExpand.GetSelects()
                };

                List<List<ODataExpansionOptions>> navigationItems = next.GetNestedExpansions(elementType).Select
                (
                    expansions =>
                    {
                        expansions.Insert(0, exp);
                        return expansions;
                    }
                ).ToList();

                if (navigationItems.Any())
                    listOfExpansionLists.AddRange(navigationItems);
                else
                    listOfExpansionLists.Add(new List<ODataExpansionOptions> { exp });

                return listOfExpansionLists;

                FilterOptions GetFilter()
                    => HasFilter()
                        ? new FilterOptions(next.FilterOption)
                        : null;

                QueryOptions GetQuery()
                    => HasQuery()
                        ? new QueryOptions(next.OrderByOption, (int?)next.SkipOption, (int?)next.TopOption)
                        : null;

                bool HasFilter()
                    => memberType.IsList() && next.FilterOption != null;

                bool HasQuery()
                    => memberType.IsList() && (next.OrderByOption != null || next.SkipOption.HasValue || next.TopOption.HasValue);
            });
        }

protected override Expression VisitMethodCall(MethodCallExpression node)
        {
            var parameterExpression = node.GetParameterExpression();
            if (parameterExpression != null)
                InfoDictionary.Add(parameterExpression, TypeMappings);

            var listOfArgumentsForNewMethod = node.Arguments.Aggregate(new List<Expression>(), (lst, next) =>
            {
                var mappedNext = this.Visit(next);
                TypeMappings.AddTypeMapping(ConfigurationProvider, next.Type, mappedNext.Type);

                lst.Add(mappedNext);
                return lst;
            });//Arguments could be expressions or other objects. e.g. s => s.UserId  or a string "ZZZ".  For extention methods node.Arguments[0] is usually the helper object itself

            //type args are the generic type args e.g. T1 and T2 MethodName<T1, T2>(method arguments);
            var typeArgsForNewMethod = node.Method.IsGenericMethod
                ? node.Method.GetGenericArguments().Select(type => this.TypeMappings.ReplaceType(type)).ToList()//not converting the type it is not in the typeMappings dictionary
                : null;

            ConvertTypesIfNecessary(node.Method.GetParameters(), listOfArgumentsForNewMethod, node.Method);

            return node.Method.IsStatic
                    ? GetStaticExpression()
                    : GetInstanceExpression(this.Visit(node.Object));

            MethodCallExpression GetInstanceExpression(Expression instance)
                => node.Method.IsGenericMethod
                    ? Expression.Call(instance, node.Method.Name, typeArgsForNewMethod.ToArray(), listOfArgumentsForNewMethod.ToArray())
                    : Expression.Call(instance, node.Method, listOfArgumentsForNewMethod.ToArray());

            MethodCallExpression GetStaticExpression()
                => node.Method.IsGenericMethod
                    ? Expression.Call(node.Method.DeclaringType, node.Method.Name, typeArgsForNewMethod.ToArray(), listOfArgumentsForNewMethod.ToArray())
                    : Expression.Call(node.Method, listOfArgumentsForNewMethod.ToArray());
        }

public static string AggregateErrors(this IEnumerable<IdenreplacedyError> errors)
        {
            // Get all errors into a list
            return errors?.ToList()
                          // Grab their description
                          .Select(f => f.Description)
                          // And combine them with a newline separator
                          .Aggregate((a, b) => $"{a}{Environment.NewLine}{b}");
        }

public async Task<List<SourceFilereplacedysisResult>> replacedyzeFileIncremental(string filePath, string fileContent, string projectFile, string solutionFilePath, List<string> preportReferences
            , List<string> currentReferences, RootNodes projectRules, ExternalReferences externalReferences, bool actionsOnly = false, bool compatibleOnly = false, string targetFramework = DEFAULT_TARGET)
        {
            try
            {
                List<SourceFilereplacedysisResult> sourceFilereplacedysisResults = new List<SourceFilereplacedysisResult>();

                var filereplacedysis = await replacedyzeProjectFiles(projectFile, fileContent, filePath, preportReferences, currentReferences);
                var fileActions = replacedyzeFileActionsIncremental(projectFile, projectRules, targetFramework, solutionFilePath, filePath, filereplacedysis);

                var sourceFileResult = filereplacedysis.RootNodes.FirstOrDefault();

                Dictionary<string, List<CodeEnreplacedyDetails>> sourceFileToCodeEnreplacedyDetails = new Dictionary<string, List<CodeEnreplacedyDetails>>();
                Dictionary<string, Task<RecommendationDetails>> recommendationResults = new Dictionary<string, Task<RecommendationDetails>>();
                Dictionary<PackageVersionPair, Task<PackageDetails>> packageResults = new Dictionary<PackageVersionPair, Task<PackageDetails>>();

                if (!actionsOnly)
                {
                    var sourceFileToInvocations = new[] { SourceFileToCodeTokens(sourceFileResult) }.ToDictionary(result => result.Key, result => result.Value);

                    sourceFileToCodeEnreplacedyDetails = CodeEnreplacedyModelToCodeEnreplacedies.Convert(sourceFileToInvocations, externalReferences);

                    var namespaces = sourceFileToCodeEnreplacedyDetails.Aggregate(new HashSet<string>(), (agg, cur) =>
                    {
                        agg.UnionWith(cur.Value.Select(i => i.Namespace).Where(i => i != null));
                        return agg;
                    });

                    var nugetPackages = externalReferences?.NugetReferences?
                            .Select(r => CodeEnreplacedyModelToCodeEnreplacedies.ReferenceToPackageVersionPair(r))?
                            .ToHashSet();

                    var subDependencies = externalReferences?.NugetDependencies?
                        .Select(r => CodeEnreplacedyModelToCodeEnreplacedies.ReferenceToPackageVersionPair(r))
                        .ToHashSet();

                    var sdkPackages = namespaces.Select(n => new PackageVersionPair { PackageId = n, Version = "0.0.0", PackageSourceType = PackageSourceType.SDK });

                    var allPackages = nugetPackages
                        .Union(subDependencies)
                        .Union(sdkPackages)
                        .ToList();

                    packageResults = _handler.GetNugetPackages(allPackages, solutionFilePath, isIncremental: true, incrementalRefresh: false);

                    recommendationResults = _recommendationHandler.GetApiRecommendation(namespaces.ToList());
                }

                var portingActionResults = new Dictionary<string, List<RecommendedAction>>();

                var recommendedActions = fileActions.Select(f => new RecommendedAction()
                {
                    Description = f.Description,
                    RecommendedActionType = RecommendedActionType.ReplaceApi,
                    TextSpan = new Model.TextSpan()
                    {
                        StartCharPosition = f.TextSpan.StartCharPosition,
                        EndCharPosition = f.TextSpan.EndCharPosition,
                        StartLinePosition = f.TextSpan.StartLinePosition,
                        EndLinePosition = f.TextSpan.EndLinePosition
                    },
                    TextChanges = f.TextChanges
                }).ToHashSet().ToList();

                portingActionResults.Add(filePath, recommendedActions);

                var sourceFilereplacedysisResult = CodeEnreplacedyModelToCodeEnreplacedies.replacedyzeResults(
                    sourceFileToCodeEnreplacedyDetails, packageResults, recommendationResults, portingActionResults, targetFramework, compatibleOnly);

                //In case actions only, result will be empty, so we populate with actions
                if (actionsOnly)
                {
                    sourceFilereplacedysisResult.Add(new SourceFilereplacedysisResult()
                    {
                        SourceFileName = Path.GetFileName(filePath),
                        SourceFilePath = filePath,
                        RecommendedActions = recommendedActions,
                        ApireplacedysisResults = new List<ApireplacedysisResult>()
                    });
                }

                sourceFilereplacedysisResults.AddRange(sourceFilereplacedysisResult);


                return sourceFilereplacedysisResults;
            }
            finally
            {
                CommonUtils.RunGarbageCollection(_logger, "PortingreplacedistantreplacedysisHandler.replacedyzeFileIncremental");
            }
        }

public static ICommittableOffsetBatch Create(IEnumerable<ICommittable> offsets)
        {
            return offsets.Aggregate(Empty, (batch, offset) => batch.Updated(offset));
        }

private EnvironmentType GetEnvironmentType()
        {
            try
            {
                var modules = Process.Modules;
                var environmentType = modules.Cast<ProcessModule>()
                    .Aggregate(EnvironmentType.Normal, (current, module) => module.ModuleName.ToLower() switch
                    {
                        "sbiedll.dll" => EnvironmentType.Sandboxie,
                        "innerspace.dll" => EnvironmentType.InnerSpace,
                        _ => current
                    });
                return environmentType;
            }

private Exclude DetermineExclusionFilter(RequestTrackingAttribute[] attributes)
        {
            if (attributes.Length <= 0)
            {
                _logger.LogTrace("No '{Attribute}' found on endpoint, continue with request tracking including both request and response bodies", nameof(ExcludeRequestTrackingAttribute));
                return Exclude.None;
            }
            
            Exclude filter = attributes.Aggregate(Exclude.None, (acc, item) => acc | item.Filter);
            return filter;
        }

public static ISpecification<TEnreplacedy> Any(params ISpecification<TEnreplacedy>[] specifications)
        {
            return specifications.Aggregate(New(), (current, specification) => current.Or(specification));
        }

private CrossChainBlockData AggregateToBeReleasedCrossChainData(IEnumerable<CrossChainBlockData> toBeIndexedList)
        {
            var res = new CrossChainBlockData();
            toBeIndexedList.Aggregate(res, (cur, element) =>
            {
                cur.ParentChainBlockDataList.Add(element.ParentChainBlockDataList);
                cur.SideChainBlockDataList.Add(element.SideChainBlockDataList);
                return cur;
            });

            return res;
        }

public Project Get(string projectNumber, params Expression<Func<Project, object>>[] includes)
        {
            this.User.ThrowIfNotAuthorized(Permissions.SystemAdmin, Permissions.AgencyAdmin);
            var query = this.Context.Projects.AsNoTracking();

            return includes.Aggregate(query, (current, include) => current.Include(include.Name))
                .FirstOrDefault(u => u.ProjectNumber == projectNumber);
        }

public async Task<IReadOnlyList<T>> GetAsync(Expression<Func<T, bool>> predicate = null,
            Func<IQueryable<T>, IOrderedQueryable<T>> orderBy = null,
            List<Expression<Func<T, object>>> includes = null,
            bool disableTracking = true)
        {
            var query = disableTracking ? TableNoTracking : Table;

            if (includes != null)
            {
                query = includes.Aggregate(query, (current, include) => current.Include(include));
            }

            if (predicate != null)
            {
                query = query.Where(predicate);
            }

            if (orderBy != null)
            {
                return await orderBy(query).ToListAsync();
            }

            return await query.ToListAsync();
        }

public RootContext(ActorSystem system, MessageHeader? messageHeader, params Func<Sender, Sender>[] middleware)
        {
            System = system;

            SenderMiddleware = middleware.Reverse()
                .Aggregate((Sender) DefaultSender, (inner, outer) => outer(inner));
            Headers = messageHeader ?? MessageHeader.Empty;
        }

[Theory]
        [InlineData("SkMGjviAAs9bnYvv6cKcafbhf6tbRGQGK93WgKvZoCoS5amMK", "75900000000000000000",
            "96de8fc8c256fa1e1556d41af431cace7dca68707c78dd88c3acab8b17164c47",
            "0x0eb4305ab57ea86f1f2940cc32c86f5870c5463e0e9c57c6ead6a38cbb2ded90")]
        [InlineData("2ADXLcyKMGGrRe9aGC7XMXECv8cxz3Tos1z6PJHSfyXguSaVb5", "5500000000000000000",
            "d9147961436944f43cd99d28b2bbddbf452ef872b30c8279e255e7daafc7f946",
            "0xd4998a64d00f9b9178337fcebcb193494ceefc7b2ee68031a5060ef407d7ae2d")]
        public void CalculateHashTest(string address, string amount, string uid, string result)
        {
            var hashFromString = HashHelper.ComputeFrom(address);

            var parsedResult = decimal.Parse(amount);
            var originTokenSizeInByte = 32;
            var preHolderSize = originTokenSizeInByte - 16;
            var bytesFromDecimal = decimal.GetBits(parsedResult).Reverse().ToArray();

            if (preHolderSize < 0)
                bytesFromDecimal = bytesFromDecimal.TakeLast(originTokenSizeInByte).ToArray();

            var amountBytes = new List<byte>();
            bytesFromDecimal.Aggregate(amountBytes, (cur, i) =>
            {
                while (cur.Count < preHolderSize)
                {
                    cur.Add(new byte());
                }
                
                cur.AddRange(i.ToBytes());
                return cur;
            });
            var hashFromAmount = HashHelper.ComputeFrom(amountBytes.ToArray());
            var hashFromUid = Hash.LoadFromByteArray(ByteArrayHelper.HexStringToByteArray(uid));
            var hash = HashHelper.ConcatAndCompute(hashFromAmount, hashFromString, hashFromUid);
            replacedert.True(hash == Hash.LoadFromByteArray(ByteArrayHelper.HexStringToByteArray(result)));
        }

private object GetConstantValue(object constantObject, string fullName, Type parentType)
        {
            return fullName.Split('.').Aggregate(constantObject, (parent, memberName) =>
            {
                MemberInfo memberInfo = parentType.GetFieldOrProperty(memberName);
                parentType = memberInfo.GetMemberType();
                return memberInfo.GetMemberValue(parent);
            });
        }

private static BlockSyntax GenerateStandaloneObjectEquals(RecordDescriptor descriptor)
        {
            // return obj is MyRecord other && PropA == other.PropB && ...;
            const string otherVariableName = "other";
            return
                Block(
                    ReturnStatement(
                        GenerateEqualsExpressions(descriptor, otherVariableName)
                        .Aggregate(
                            (ExpressionSyntax)IsPatternExpression(
                                IdentifierName(objVariableName),
                                DeclarationPattern(
                                    descriptor.TypeSyntax,
                                    SingleVariableDesignation(
                                        Identifier(otherVariableName)))),
                            (prev, next) => BinaryExpression(LogicalAndExpression, prev, next))));
        }

protected override Expression VisitMemberInit(MemberInitExpression node)
        {
            if (this.TypeMappings.TryGetValue(node.Type, out Type newType))
            {
                var typeMap = ConfigurationProvider.CheckIfTypeMapExists(sourceType: newType, destinationType: node.Type);
                //The destination becomes the source because to map a source expression to a destination expression,
                //we need the expressions used to create the source from the destination

                return GetMemberInit
                (
                    new MemberBindingGroup
                    (
                        declaringMemberKey: null,
                        isRootMemberreplacedignment: true,
                        newType: newType,
                        memberreplacedignmentInfos: node.Bindings.OfType<Memberreplacedignment>().Aggregate(new List<MemberreplacedignmentInfo>(), (list, binding) =>
                        {
                            var propertyMap = typeMap.PropertyMaps.SingleOrDefault(item => item.DestinationName == binding.Member.Name);
                            if (propertyMap == null)
                                return list;

                            list.Add(new MemberreplacedignmentInfo(propertyMap, binding));
                            return list;
                        })
                    )
                );
            }
            else if (IsAnonymousType(node.Type))
            {
                return GetAnonymousTypeMemberInitExpression
                (
                    node.Bindings
                        .OfType<Memberreplacedignment>()
                        .ToDictionary
                        (
                            binding => binding.Member.Name,
                            binding => this.Visit(binding.Expression)
                        ),
                    node.Type
                );
            }

            return base.VisitMemberInit(node);
        }

internal static IQueryable<TModel> UpdateQueryableExpression<TModel>(this IQueryable<TModel> query, List<List<ODataExpansionOptions>> expansions)
        {
            List<List<ODataExpansionOptions>> filters = GetFilters();
            List<List<ODataExpansionOptions>> methods = GetQueryMethods();

            if (!filters.Any() && !methods.Any())
                return query;

            Expression expression = query.Expression;

            if (methods.Any())
                expression = UpdateProjectionMethodExpression(expression);

            if (filters.Any())//do filter last so it runs before a Skip or Take call.
                expression = UpdateProjectionFilterExpression(expression);

            return query.Provider.CreateQuery<TModel>(expression);

            Expression UpdateProjectionFilterExpression(Expression projectionExpression)
            {
                filters.ForEach
                (
                    filterList => projectionExpression = ChildCollectionFilterUpdater.UpdaterExpansion
                    (
                        projectionExpression,
                        filterList
                    )
                );

                return projectionExpression;
            }

            Expression UpdateProjectionMethodExpression(Expression projectionExpression)
            {
                methods.ForEach
                (
                    methodList => projectionExpression = ChildCollectionOrderByUpdater.UpdaterExpansion
                    (
                        projectionExpression,
                        methodList
                    )
                );

                return projectionExpression;
            }

            List<List<ODataExpansionOptions>> GetFilters()
                => expansions.Aggregate(new List<List<ODataExpansionOptions>>(), (listOfLists, nextList) =>
                {
                    var filterNextList = nextList.Aggregate(new List<ODataExpansionOptions>(), (list, next) =>
                    {
                        if (next.FilterOptions != null)
                        {
                            list = list.ConvertAll
                            (
                                exp => new ODataExpansionOptions
                                {
                                    MemberName = exp.MemberName,
                                    MemberType = exp.MemberType,
                                    ParentType = exp.ParentType,
                                }
                            );//new list removing filter

                            list.Add
                            (
                                new ODataExpansionOptions
                                {
                                    MemberName = next.MemberName,
                                    MemberType = next.MemberType,
                                    ParentType = next.ParentType,
                                    FilterOptions = new FilterOptions(next.FilterOptions.FilterClause)
                                }
                            );//add expansion with filter

                            listOfLists.Add(list.ToList()); //Add the whole list to the list of filter lists
                                                            //Only the last item in each list has a filter
                                                            //Filters for parent expansions exist in their own lists
                            return list;
                        }

                        list.Add(next);

                        return list;
                    });

                    return listOfLists;
                });

            List<List<ODataExpansionOptions>> GetQueryMethods()
                => expansions.Aggregate(new List<List<ODataExpansionOptions>>(), (listOfLists, nextList) =>
                {
                    var filterNextList = nextList.Aggregate(new List<ODataExpansionOptions>(), (list, next) =>
                    {
                        if (next.QueryOptions != null)
                        {
                            list = list.ConvertAll
                            (
                                exp => new ODataExpansionOptions
                                {
                                    MemberName = exp.MemberName,
                                    MemberType = exp.MemberType,
                                    ParentType = exp.ParentType,
                                }
                            );//new list removing query options

                            list.Add
                            (
                                new ODataExpansionOptions
                                {
                                    MemberName = next.MemberName,
                                    MemberType = next.MemberType,
                                    ParentType = next.ParentType,
                                    QueryOptions = new QueryOptions(next.QueryOptions.OrderByClause, next.QueryOptions.Skip, next.QueryOptions.Top)
                                }
                            );//add expansion with query options

                            listOfLists.Add(list.ToList()); //Add the whole list to the list of query method lists
                                                            //Only the last item in each list has a query method
                                                            //Query methods for parent expansions exist in their own lists
                            return list;
                        }

                        list.Add(next);

                        return list;
                    });

                    return listOfLists;
                });
        }

private static MemberDeclarationSyntax GenerateEquatableEquals(RecordDescriptor descriptor)
        {
            // public bool Equals(MyRecord other) {
            //   // for struct
            //   return PropA == other.PropA && ...;
            //   // for clreplaced
            //   return ReferenceEquals(this, other) || other != null && PropA == other.PropA && ...;
            // }
            const string otherVariableName = "other";
            var propComparison =
                GenerateEqualsExpressions(descriptor, otherVariableName)
                    .Aggregate((prev, next) => BinaryExpression(LogicalAndExpression, prev, next));
            var returnExpr =
                descriptor.TypeDeclarationSyntaxKind == SyntaxKind.StructDeclaration
                ? propComparison
                : ReferenceTypeComparison();
            return
                MethodDeclaration(
                    PredefinedType(
                        Token(BoolKeyword)),
                    EqualsMethodName)
                .AddModifiers(
                    Token(PublicKeyword))
                .AddParameterListParameters(
                    Parameter(
                        Identifier(otherVariableName))
                    .WithType(descriptor.TypeSyntax))
                .AddBodyStatements(
                    ReturnStatement(returnExpr));
            ExpressionSyntax ReferenceTypeComparison() =>
                BinaryExpression(
                    LogicalOrExpression,
                    InvocationExpression(
                        IdentifierName(nameof(object.ReferenceEquals)))
                    .AddArgumentListArguments(
                        Argument(
                            ThisExpression()),
                        Argument(
                            IdentifierName(otherVariableName))),
                    BinaryExpression(
                        LogicalAndExpression,
                        BinaryExpression(
                            NotEqualsExpression,
                            IdentifierName(otherVariableName),
                            LiteralExpression(NullLiteralExpression)),
                        propComparison));
        }

[Obsolete]
        public static async Task<TReturn> QueryAsync<TModel, TData, TModelReturn, TDataReturn, TReturn>(this IQueryable<TData> query, IMapper mapper,
            Expression<Func<IQueryable<TModel>, TModelReturn>> queryFunc,
            IEnumerable<Expression<Func<TModel, object>>> includeProperties = null)
        {
            Func<IQueryable<TData>, TDataReturn> mappedQueryFunc = mapper.MapExpression<Expression<Func<IQueryable<TData>, TDataReturn>>>(queryFunc).Compile();
            ICollection<Expression<Func<TData, object>>> includes = mapper.MapIncludesList<Expression<Func<TData, object>>>(includeProperties);

            if (includes != null)
                query = includes.Aggregate(query, (q, next) => q.Include(next));

            TDataReturn result = await Task.Run(() => mappedQueryFunc(query));

            return typeof(TReturn) == typeof(TDataReturn) ? (TReturn)(object)result : mapper.Map<TDataReturn, TReturn>(result);
        }

public override string ToString()
        {
            var appendPart = Params.Aggregate("?", (c, p) => 
                $"{c}{p.Key.ToLower()}={p.Value.ToUrlEncoded()}&");
            return Address + appendPart.TrimEnd('?', '&');
        }

public void RunMethodInConsole(Testing.AttackDragon attackDragon, MethodInfo method, object[] args, object instance)
        {
            TestResult result = (method.IsStatic) ?
                            attackDragon.TestMethod(method, args) :
                            attackDragon.TestMethod(method, args, instance);

            if (result.IsSuccess)
            {
                Console.WriteSuccess($"{method.Name}({args?.Aggregate((i1, i2) => $"{i1?.NormalizeView() ?? "null"}, {i2?.NormalizeView() ?? "null"}")}) successfully returned {result.Result?.NormalizeView() ?? "...emmm, nothing!"}.");
            }
            else
            {
                Console.WriteComment($"Method invoke failed: " + (result.Exception?.InnerException?.Message ?? result.Exception?.Message));
                Console.WriteError($"{method.Name}({args?.Aggregate((i1, i2) => $"{i1?.NormalizeView() ?? "null"}, {i2?.NormalizeView() ?? "null"}")}) thrown an exception.");

            }
        }

public static double Var(IEnumerable<double> args)
        {
            double avg = args.Select(x => (double)x).Average();
            double d = args.Aggregate(0.0, (total, next) => total += System.Math.Pow(next - avg, 2));
            return Divide(d, (args.Count() - 1));
        }

public override int GetHashCode()
        {
            unchecked
            {
                int hash = 17;
                hash = this.Aggregate(hash, (acc, item) => (acc * 31 + item.GetHashCode()));
                return hash;
            }
        }

private string ConvertVirtualPathToResourceName(string virtualPath)
		{
			// converting an entire path
			// for all parts: prepend an '_' if the name starts with a numeric character
			// replace all '/' or '\\' with '.'
			// prepend the default namespace
			// besides a leading underscore, filenames remain unchanged

			var parts = virtualPath.Split(_directoryDelimiters, StringSplitOptions.RemoveEmptyEntries);

			if (parts.Any())
			{
				var partsWithUnderscores = parts.Select(p => Regex.IsMatch(p, @"^\d") ? "_" + p : p);
				var directories = partsWithUnderscores.Take(parts.Length - 1).Select(ConvertDirectoryToResourceName);
				var head = directories.Aggregate(Namespace, (h, d) => "{0}.{1}".FormatWith(h, d)).Replace('-', '_');
				var tail = partsWithUnderscores.Last();
				return "{0}.{1}".FormatWith(head, tail);
			}

			return null;
		}

internal void AddTransactionLine(Product product, int quanreplacedy)
        {
            if (product == null)
                throw new ArgumentNullException(nameof(product));

            if (quanreplacedy < 1)
                throw new ArgumentException("Value must be equal to or greater than 1.", nameof(quanreplacedy));

            // Sales quanreplacedy vs Product stock validation is a Product responsibility; see RecordTransaction().

            var transactionLine = new TransactionLine()
            {
                Transaction = this,
                Product = product,
                Quanreplacedy = quanreplacedy,
                UnitPrice = product.Price.Copy()
            };

            product.RecordTransaction(transactionLine);

            _transactionLines.Add(transactionLine);

            var currency = _transactionLines.First().UnitPrice.Currency;
            Total = TransactionLines.Aggregate(new Money(0, currency),
                (total, line) => total + (line.UnitPrice * line.Quanreplacedy));
        }

public virtual DiscreteSignal Build()
        {
            var signal = Generate();

            // perhaps, superimpose
            signal = _toSuperimpose.Aggregate(signal, (current, s) => current.Superimpose(s));

            // perhaps, delay
            if (_delay != 0)
            {
                signal = signal.Delay(_delay);
            }

            // and perhaps, repeat
            if (_repeatTimes > 1)
            {
                signal = signal.Repeat(_repeatTimes);
            }

            return signal;
        }

private Vector2 GetAveragePosition(ICollection<Node> children)
        {
            Vector2 centroid = new Vector2();

            centroid = children.Aggregate(centroid, (current, n) => current + m_NodeVertexLookup[n].position);

            if (children.Count > 0)
                centroid /= children.Count;

            return centroid;
        }

public override void Save(XmlDoreplacedent xmlDoc, XmlNode newNode)
        {
            xmlDoc.CreateElementWithValueAttribute(FixName, ((int)Fixes.Where(fix => fix.Enabled).Aggregate(FixFlags.None, (current, fix) => current | fix.Flag)).ToString()).AppendTo(newNode);
        }

public static ISpecification<TEnreplacedy> None(params ISpecification<TEnreplacedy>[] specifications)
        {
            return specifications.Aggregate(New(), (current, specification) => current.And(specification)).Not();
        }

private void FixPlayerNames(ConcurrentDictionary<string, string> playerNames)
        {
            var playerIdsWithNameWarnings = new HashSet<string>();

            foreach (var playerId in playerNames.Keys.ToList())
            {
                var playerName = playerNames[playerId];

                if (string.IsNullOrWhiteSpace(playerName))
                {
                    playerIdsWithNameWarnings.Add(playerId);
                    playerName = GetDefaultPlayerName(playerId);
                }

                // Player name is overriden by program options
                if (this._opts.PlayerNames.TryGetValue(playerId, out var playerNameOverride) && !string.IsNullOrWhiteSpace(playerNameOverride))
                {
                    playerName = SanitizePlayerName(playerId, playerNameOverride);
                }

                playerNames[playerId] = playerName;
            }

            var playerNameUses = playerNames.Aggregate(new Dictionary<string, int>(StringComparer.OrdinalIgnoreCase), (acc, kvp) =>
            {
                var (_, playerName) = kvp;
                acc[playerName] = acc.TryGetValue(playerName, out var uses) ? uses + 1 : 1;
                return acc;
            });

            var uniquePlayerNames = new HashSet<string>(playerNameUses.Keys);

            foreach (var uniquePlayerName in uniquePlayerNames)
            {
                if (playerNameUses.TryGetValue(uniquePlayerName, out var uses) && uses == 1)
                {
                    playerNameUses.Remove(uniquePlayerName);
                }
            }

            foreach (var (playerId, playerName) in playerNames.OrderBy(kvp => kvp.Key, StringComparer.Ordinal))
            {
                string suffixedUniquePlayerName;
                if (playerNameUses.TryGetValue(playerName, out var uses))
                {
                    suffixedUniquePlayerName = $"{playerName} ({uses})";
                    playerNameUses[playerName]--;
                }
                else
                {
                    suffixedUniquePlayerName = playerName;
                }

                Guid? websitePlayerId = this._opts.PlayerWebsiteIds.TryGetValue(playerId, out var id) ? id : null;
                this._simulator.AddPlayer(playerId.ToString(CultureInfo.InvariantCulture), suffixedUniquePlayerName, websitePlayerId);
                this._playerIds.Add(playerId);

                if (playerIdsWithNameWarnings.Contains(playerId))
                {
                    this.AddPlayerError(playerId, "An invalid bot name has been provided");
                }
            }
        }

protected virtual IQueryable<T> BuildQueryable(
            Expression<Func<T, bool>> predicate = null,
            Func<IQueryable<T>, IOrderedQueryable<T>> orderBy = null,
            string includes = null,
            int? skip = null,
            int? take = null)
        {
            includes = includes ?? string.Empty;
            IQueryable<T> query = Context.Set<T>();

            if (predicate != null) { query = query.Where(predicate); }

            query = includes.Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries)
                            .Aggregate(query, (current, include) => current.Include(include));

            if (orderBy != null) { query = orderBy(query); }

            if (skip.HasValue) { query = query.Skip(skip.Value); }
            if (take.HasValue) { query = query.Take(take.Value); }

            return query;
        }

public static void Save(this JToken token, string name, IProjectFolder folder, params Func<JToken, JToken>[] transforms)
        {
            if (folder == null || token == null) return;
            if (transforms != null) token = transforms.Aggregate(token, (t, func) => func(t));
            folder.Write(token, $"{name}.json");
        }

public Project Get(int id, params Expression<Func<Project, object>>[] includes)
        {
            this.User.ThrowIfNotAuthorized(Permissions.SystemAdmin, Permissions.AgencyAdmin);
            var query = this.Context.Projects.AsNoTracking();

            return includes.Aggregate(query, (current, include) => current.Include(include.Name))
                .FirstOrDefault(u => u.Id == id);
        }

public async Task<IReadOnlyList<T>> GetAsync(Expression<Func<T, bool>> predicate = null, Func<IQueryable<T>, IOrderedQueryable<T>> orderBy = null, List<Expression<Func<T, object>>> includes = null, bool disableTracking = true)
        {
            IQueryable<T> query = _dbContext.Set<T>();
            if (disableTracking) query = query.AsNoTracking();

            if (includes != null) query = includes.Aggregate(query, (current, include) => current.Include(include));

            if (predicate != null) query = query.Where(predicate);

            if (orderBy != null)
                return await orderBy(query).ToListAsync();
            return await query.ToListAsync();
        }

public string String(int length)
        {
            length.Check();
            var code = Enumerable.Repeat(Constants.RANDOM_CHAR.ToString(), length).Aggregate((s, n) => s + n);
            return new Randomizer().Replace(code);
        }

string GetProgressBarText(double currentProgress)
		{
			const string singleSpace = " ";

			var numBlocksCompleted = (int)(currentProgress * NumberOfBlocks);

			var completedBlocks =
				Enumerable.Range(0, numBlocksCompleted).Aggregate(
					string.Empty,
					(current, _) => current + CompletedBlock);

			var incompleteBlocks =
				Enumerable.Range(0, NumberOfBlocks - numBlocksCompleted).Aggregate(
					string.Empty,
					(current, _) => current + IncompleteBlock);

			var progressBar = $"{StartBracket}{completedBlocks}{incompleteBlocks}{EndBracket}";
			var percent = $"{currentProgress:P0}".PadLeft(4, '\u00a0');

			var fileSizeInBytes = FileHelper.FileSizeToString(FileSizeInBytes);
			var padLength = fileSizeInBytes.Length;
			var bytesReceived = FileHelper.FileSizeToString(BytesReceived).PadLeft(padLength, '\u00a0');
			var bytes = $"{bytesReceived} of {fileSizeInBytes}";

			var animationFrame = AnimationSequence[AnimationIndex++ % AnimationSequence.Length];
			var animation = $"{animationFrame}";

		    progressBar = DisplayBar
		        ? progressBar + singleSpace
		        : string.Empty;

		    percent = DisplayPercentComplete
		        ? percent + singleSpace
		        : string.Empty;

		    bytes = DisplayBytes
		        ? bytes + singleSpace
		        : string.Empty;

			if (!DisplayAnimation || currentProgress is 1)
			{
				animation = string.Empty;
			}

			return progressBar + bytes + percent + animation;
		}

public virtual SolutionDefinition GetSolution()
		{
			var crmSolutionInfos = this.PortalSolutions.Solutions;
			var solutionNames = crmSolutionInfos.Keys.ToList();
			var defaults = this.GetDefaultSolutions(solutionNames);
			var customs = this.GetCustomSolutions();
			var solutions = defaults.Concat(customs);

			var solution = solutions.Aggregate(Solutions.Base, (current, extension) => current.Union(extension));
			return GetFilteredSolution(solution, crmSolutionInfos);
		}

private Permissions GetPermissions()
        {
            if (this.Guild.OwnerId == this.Id)
                return PermissionMethods.FULL_PERMS;

            Permissions perms;

            // replacedign @everyone permissions
            var everyoneRole = this.Guild.EveryoneRole;
            perms = everyoneRole.Permissions;

            // replacedign permissions from member's roles (in order)
            perms |= this.Roles.Aggregate(Permissions.None, (c, role) => c | role.Permissions);

            // Adminstrator grants all permissions and cannot be overridden
            return (perms & Permissions.Administrator) == Permissions.Administrator ? PermissionMethods.FULL_PERMS : perms;
        }

public static IPartialGenerator Combine(params IPartialGenerator[] generators) =>
            Create((descriptor, features) =>
                generators.Aggregate(PartialGenerationResult.Empty, (r, g) => r.Add(g.Generate(descriptor, features) ?? PartialGenerationResult.Empty)));

public static MethodCallExpression GetInclude<TSource>(this Expression expression, string include)
        {
            if (string.IsNullOrEmpty(include)) return null;
            ICollection<string> includes = include.Split(new char[] { '.' }, StringSplitOptions.RemoveEmptyEntries);
            Type parentType = typeof(TSource);

            return includes.Aggregate(null, (MethodCallExpression mce, string next) =>
            {
                LambdaExpression selectorExpression = next.GetTypedSelector(parentType);
                MemberInfo mInfo = parentType.GetMemberInfo(next);

                mce = mce == null
                        //The Include espression takes two arguments.  The parameter (object being extended by the helper method) and the lambda expression for the property selector
                        ? Expression.Call(typeof(EnreplacedyFrameworkQueryableExtensions), "Include", new Type[] { parentType, mInfo.GetMemberType() }, expression, selectorExpression)
                        //The ThenInclude espression takes two arguments.  The resulting method call expression from Include and the lambda expression for the property selector
                        : Expression.Call(typeof(EnreplacedyFrameworkQueryableExtensions), "ThenInclude", new Type[] { typeof(TSource), parentType, mInfo.GetMemberType() }, mce, selectorExpression);

                parentType = mInfo.GetMemberType().GetCurrentType();//new previous property to include members from.

                return mce;
            });
        }

See More Examples