Share via

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

  • Article

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

Parameters

  • 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.

Exceptions

Exception

Condition

ArgumentNullException

Thrown when the input sequence is null.

Return Value

The result sequence.

Remarks

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.

Platforms

Windows 7, Windows Vista SP2, Windows XP SP3, Windows XP x64 SP2, Windows Server 2008 R2, Windows Server 2008 SP2, Windows Server 2003 SP2

Version Information

F# Runtime

Supported in: 2.0, 4.0

Silverlight

Supported in: 3

See Also

Reference

Collections.Seq Module (F#)

Microsoft.FSharp.Collections Namespace (F#)