Set.foldBack<'T,'State> Function (F#)

Applies the given accumulating function to all the elements of the set.

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

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

// Signature:
Set.foldBack : ('T -> 'State -> 'State) -> Set<'T> -> 'State -> 'State (requires comparison)

// Usage:
Set.foldBack folder set state


  • folder
    Type: 'T -> 'State -> 'State

    The accumulating function.

  • set
    Type: Set<'T>

    The input set.

  • state
    Type: 'State

    The initial state.

Return Value

The final state.


This function is named FoldBack 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

Version Information

F# Core Library Versions

Supported in: 2.0, 4.0, Portable

See Also


Collections.Set Module (F#)

Microsoft.FSharp.Collections Namespace (F#)