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

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.

Exception

Condition

ArgumentNullException

Thrown when the input sequence is null

KeyNotFoundException

Thrown if no element returns true when evaluated by the predicate

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

F# Core Library Versions

Supported in: 2.0, 4.0, Portable

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