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

Returns the first element for which the given function returns true. Raises KeyNotFoundException if no such element exists.

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

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

// Signature:
List.find : ('T -> bool) -> 'T list -> 'T

// Usage:
List.find predicate list

predicate

Type: 'T -> bool

The function to test the input elements.

list

Type: 'T list

The input list.

Exception

Condition

KeyNotFoundException

Thrown if the predicate evaluates to false for all the elements of the list.

The first element that satisfies the predicate.

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 illustrates the use of List.find.

let isDivisibleBy number elem = elem % number = 0
let result = List.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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