Class EnumerableHelpers

Extension methods for IEnumerable collections

Inheritance

System.Object

EnumerableHelpers

Inherited Members

System.Object.Equals(System.Object)

System.Object.Equals(System.Object, System.Object)

System.Object.GetHashCode()

System.Object.GetType()

System.Object.MemberwiseClone()

System.Object.ReferenceEquals(System.Object, System.Object)

System.Object.ToString()

Namespace:numl.Utils

Assembly:numl.dll

Syntax

public static class EnumerableHelpers

Methods

View Source

Batch<T>(IEnumerable<T>, Int32, Action<Int32, IEnumerable<T>>, Boolean, Int32)

Executes a batch operation on the source collection, optionally running in parallel.

Declaration

public static void Batch<T>(this IEnumerable<T> source, int batchSize, Action<int, IEnumerable<T>> batchCommand, bool asParallel = false, int threads = 1)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T>	source	Enumerable to batch.
System.Int32	batchSize	Size of each batch.
System.Action<System.Int32, System.Collections.Generic.IEnumerable<T>>	batchCommand	Action to apply on each batch, with batch index and corresponding items.
System.Boolean	asParallel	If `True`, each batch is run asynchronously.
System.Int32	threads	Number of worker threads.

Type Parameters

Name	Description
T	Type.

View Source

ForEach<T, R>(IEnumerable<T>, Func<T, R>)

Performs the specified action and returns the result.

Declaration

public static IEnumerable<R> ForEach<T, R>(this IEnumerable<T> source, Func<T, R> fnTransform)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T>	source	Source array
System.Func<T, R>	fnTransform	Function to apply to each element

Returns

Type	Description
System.Collections.Generic.IEnumerable<R>

Type Parameters

Name	Description
T
R

View Source

Head<T, R>(IEnumerable<T>, Func<T, R>)

Returns the first element in a sequence applying the transform function.

Declaration

public static R Head<T, R>(this IEnumerable<T> source, Func<T, R> fnSelector)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T>	source	Source.
System.Func<T, R>	fnSelector	Selector.

Returns

Type	Description
R

Type Parameters

Name	Description
T
R

View Source

Head<T, R>(IEnumerable<T>, Int32, Func<T, R>)

Returns the first element in a sequence applying the transform function.

Declaration

public static IEnumerable<R> Head<T, R>(IEnumerable<T> source, int count, Func<T, R> fnSelector)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T>	source	Source.
System.Int32	count	Number of items from the top to return.
System.Func<T, R>	fnSelector	Selector.

Returns

Type	Description
System.Collections.Generic.IEnumerable<R>

Type Parameters

Name	Description
T
R

View Source

IndexOf<T>(IEnumerable<T>, T)

Gets the index of the specified item in the source array.

Declaration

public static int IndexOf<T>(this IEnumerable<T> source, T item)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T>	source	Source array
T	item	Object to test for.

Returns

Type	Description
System.Int32

Type Parameters

Name	Description
T

View Source

IndexOf<T>(IEnumerable<T>, Func<T, Boolean>)

Gets the index of the specified item in the source array using the specified test function.

Declaration

public static int IndexOf<T>(this IEnumerable<T> source, Func<T, bool> fnPredicate)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T>	source	Source array
System.Func<T, System.Boolean>	fnPredicate	Predicate to test for.

Returns

Type	Description
System.Int32	Int.

Type Parameters

Name	Description
T

View Source

IsAscending(IEnumerable<Double>)

Calculates the slope of the source array and returns True if the values are increasing.

Declaration

public static bool IsAscending(this IEnumerable<double> source)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<System.Double>	source

Returns

Type	Description
System.Boolean

View Source

Random<T>(IEnumerable<T>)

Returns a random element from the sequence.

Declaration

public static T Random<T>(this IEnumerable<T> source)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T>	source	Source sequence.

Returns

Type	Description
T

Type Parameters

Name	Description
T

View Source

Shuffle<T>(IEnumerable<T>)

Randomly shuffles the indexing of the source array.

Declaration

public static IEnumerable<T> Shuffle<T>(this IEnumerable<T> source)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T>	source	Source sequence.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T>

Type Parameters

Name	Description
T

View Source

Slice<T>(IEnumerable<T>, IEnumerable<Int32>)

Returns the slice of objects using the specified index arrays.

Declaration

public static IEnumerable<T> Slice<T>(this IEnumerable<T> source, IEnumerable<int> indices)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T>	source
System.Collections.Generic.IEnumerable<System.Int32>	indices

Returns

Type	Description
System.Collections.Generic.IEnumerable<T>

Type Parameters

Name	Description
T

View Source

StandardDeviation<TSource>(IEnumerable<TSource>, Func<TSource, Double>, Boolean)

Calculates the standard deviation on the source collection

Declaration

public static double StandardDeviation<TSource>(this IEnumerable<TSource> source, Func<TSource, double> fnPropSelector, bool isSamplePopulation = false)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<TSource>	source
System.Func<TSource, System.Double>	fnPropSelector
System.Boolean	isSamplePopulation

Returns

Type	Description
System.Double

Type Parameters

Name	Description
TSource

View Source

Tail<T, R>(IEnumerable<T>, Func<T, R>)

Returns the last element in a sequence applying the transform function.

Declaration

public static R Tail<T, R>(this IEnumerable<T> source, Func<T, R> fnSelector)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T>	source	Source.
System.Func<T, R>	fnSelector	Selector.

Returns

Type	Description
R

Type Parameters

Name	Description
T
R

View Source

Tail<T, R>(IEnumerable<T>, Int32, Func<T, R>)

Returns the last elements in a sequence applying the transform function.

Declaration

public static IEnumerable<R> Tail<T, R>(this IEnumerable<T> source, int count, Func<T, R> fnSelector)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T>	source	Source.
System.Int32	count	Number of items from the end to return.
System.Func<T, R>	fnSelector	Selector.

Returns

Type	Description
System.Collections.Generic.IEnumerable<R>

Type Parameters

Name	Description
T
R

View Source

Variance<TSource>(IEnumerable<TSource>, Func<TSource, Double>, Boolean)

Calculates the variance on the source collection

Declaration

public static double Variance<TSource>(this IEnumerable<TSource> source, Func<TSource, double> fnPropSelector, bool isSamplePopulation = false)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<TSource>	source
System.Func<TSource, System.Double>	fnPropSelector
System.Boolean	isSamplePopulation

Returns

Type	Description
System.Double

Type Parameters

Name	Description
TSource