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Seq.scan<'T,'State> Function (F#)

Like Seq.fold, but computes on-demand and returns the sequence of intermediate and final results.

Namespace/Module Path: Microsoft.FSharp.Collections.Seq

Assembly: FSharp.Core (in FSharp.Core.dll)

// Signature:
Seq.scan : ('State -> 'T -> 'State) -> 'State -> seq<'T> -> seq<'State>

// Usage:
Seq.scan folder state source
folder

Type: 'State -> 'T -> 'State

A function that updates the state with each element from the sequence.

state

Type: 'State

The initial state.

source

Type: seq<'T>

The input sequence.

Exception

Condition

ArgumentNullException

Thrown when the input sequence is null.

The result sequence.

This function is named Scan in compiled assemblies. If you are accessing the function from a language other than F#, or through reflection, use this name.

Windows 8, Windows 7, Windows Server 2012, Windows Server 2008 R2

F# Core Library Versions

Supported in: 2.0, 4.0, Portable

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