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

Den Delimarsky|Last Updated: 8/18/2017
1 Contributor

Returns the first element for which the given function returns true.

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

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


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

// Usage:
Seq.find predicate source


predicate Type: 'T ->bool

A function to test whether an item in the sequence should be returned.

source Type: seq<'T>

The input sequence.


ArgumentNullExceptionThrown when the input sequence is null
KeyNotFoundExceptionThrown if no element returns true when evaluated by the predicate

Return Value

Returns the first element for which the given function returns true.


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


The following code example shows how to use Seq.find.

let isDivisibleBy number elem = elem % number = 0
let result = Seq.find (isDivisibleBy 5) [ 1 .. 100 ]
printfn "%d " result

Output 5


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.Seq Module (F#)

Microsoft.FSharp.Collections Namespace (F#)

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