MoreEnumerable.WindowLeft<TSource> Method

Creates a left-aligned sliding window of a given size over the source sequence.

Definition

Namespace: MoreLinq
Assembly: MoreLinq (in MoreLinq.dll) Version: 3.4.0+b99a6a8cc504caf2d48372fe54a2f8116c59cd0c

C#
public static IEnumerable<IList<TSource>> WindowLeft<TSource>(
	this IEnumerable<TSource> source,
	int size
)

VB
<ExtensionAttribute>
Public Shared Function WindowLeft(Of TSource) ( 
	source As IEnumerable(Of TSource),
	size As Integer
) As IEnumerable(Of IList(Of TSource))

C++
public:
[ExtensionAttribute]
generic<typename TSource>
static IEnumerable<IList<TSource>^>^ WindowLeft(
	IEnumerable<TSource>^ source, 
	int size
)

F#
[<ExtensionAttribute>]
static member WindowLeft : 
        source : IEnumerable<'TSource> * 
        size : int -> IEnumerable<IList<'TSource>> 

Parameters

source IEnumerable<TSource>: The sequence over which to create the sliding window.
size Int32: Size of the sliding window.

Type Parameters

TSource: The type of the elements of source.

Return Value

IEnumerable<IList<TSource>>
A sequence representing each sliding window.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable<TSource>. 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

A window can contain fewer elements than size, especially as it slides over the end of the sequence.

This operator uses deferred execution and streams its results.

Example

C#
Console.WriteLine(
    Enumerable
        .Range(1, 5)
        .WindowLeft(3)
        .Select(w => "AVG(" + w.ToDelimitedString(",") + ") = " + w.Average())
        .ToDelimitedString(Environment.NewLine));

// Output:
// AVG(1,2,3) = 2
// AVG(2,3,4) = 3
// AVG(3,4,5) = 4
// AVG(4,5) = 4.5
// AVG(5) = 5