Seq.reduce<'T> Function (F#)

Applies a function to each element of the sequence, threading an accumulator argument through the computation. This function begins by applying the function to the first two elements. It then passes this result into the function along with the third element and so on. The function returns the final result.

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

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

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

// Usage:
Seq.reduce reduction source

Parameters

• reduction
  Type: 'T -> 'T -> 'T

  A function that takes in the current accumulated result and the next element of the sequence to produce the next accumulated result.

• source
  Type: seq<'T>

  The input sequence.

Exceptions

Exception	Condition
ArgumentException	Thrown when the input sequence is empty.
ArgumentNullException	Thrown when the input sequence is null.

Return Value

The result of the computation.

Remarks

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

Platforms

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

Reference

Collections.Seq Module (F#)

Microsoft.FSharp.Collections Namespace (F#)