selectSelectT, R Method (ICollectionT, FuncT, R, FuncR, T)

Get a 1-1 invertible mapping of an ICollectionT.

Namespace: WhetStone.Looping
Assembly: WhetStone (in WhetStone.dll) Version: 1.0.4.0 (1.0.0.0)

Syntax

public static ICollection<R> Select<T, R>(
	this ICollection<T> this,
	Func<T, R> selector,
	Func<R, T> inverse
)

Parameters

this: Type: System.Collections.GenericICollectionT
The ICollectionT to map.
selector: Type: SystemFuncT, R
The mapping function.
inverse: Type: SystemFuncR, T
The inverse of selector.

Type Parameters

T: The type of the original ICollectionT.
R: The type of the returned ICollectionT.

Return Value

Type: ICollectionR
A mutability passing ICollectionT with selector applied on this's elements.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type ICollectionT. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).

Remarks

Alongside allowing mutating this, the return value can optimize some methods:

Examples

Copy

var arr = range.IRange(-850,5000,9) //immutable, but searching is an O(1) operation.
var range+1 = arr.Select(a=>a+1,b=>b-1)
negPrimes.Contains(-53) //will perform O(1) operation, searching for -54 in an IRange.

Reference

select Class

Select Overload

WhetStone.Looping Namespace