Class CollectionExtensions

Inheritance

System.Object

CollectionExtensions

Namespace: Edgar.Legacy.GeneralAlgorithms.Algorithms.Common

Assembly: Edgar.dll

Syntax

public static class CollectionExtensions : Object

Methods

GetWeightedRandom<T>(IList<T>, Func<T, Double>, Random)

Returns a random number based on a given weight function.

Declaration

public static T GetWeightedRandom<T>(this IList<T> elements, Func<T, double> weightSelector, Random random)

Parameters

Type	Name	Description
System.Collections.Generic.IList<T>	elements	Collection of elements.
System.Func<T, System.Double>	weightSelector	A function that assigns weight to individual elements.
System.Random	random	Random number generator to be used.

Returns

Type	Description
T

Type Parameters

Name	Description
T

MaxBy<TElement, TResult>(IEnumerable<TElement>, Func<TElement, TResult>)

Computes an index of the first maximum element with respect to a given function.

Declaration

public static int MaxBy<TElement, TResult>(this IEnumerable<TElement> collection, Func<TElement, TResult> func)
    where TResult : IComparable<TResult>

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<TElement>	collection
System.Func<TElement, TResult>	func

Returns

Type	Description
System.Int32

Type Parameters

Name	Description
TElement
TResult

MinBy<TElement, TResult>(IEnumerable<TElement>, Func<TElement, TResult>)

Computes an index of the first minimum element with respect to a given function.

Declaration

public static int MinBy<TElement, TResult>(this IEnumerable<TElement> collection, Func<TElement, TResult> func)
    where TResult : IComparable<TResult>

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<TElement>	collection
System.Func<TElement, TResult>	func

Returns

Type	Description
System.Int32

Type Parameters

Name	Description
TElement
TResult

SequenceEqualWithoutOrder<T>(IEnumerable<T>, IEnumerable<T>)

Check if two collections are equal. The order does not matter.

Declaration

public static bool SequenceEqualWithoutOrder<T>(this IEnumerable<T> firstEnumerable, IEnumerable<T> secondEnumerable)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T>	firstEnumerable
System.Collections.Generic.IEnumerable<T>	secondEnumerable

Returns

Type	Description
System.Boolean

Type Parameters

Name	Description
T

Remarks

Both collection must have only unique elements. The method is quite slow - it runs in O(n^2) where n is the number of elements.