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

Attempts to find the first element that satisfies a given predicate, and returns the index of the matching element.

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

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

// Signature:
Seq.tryFindIndex : ('T -> bool) -> seq<'T> -> int option

// Usage:
Seq.tryFindIndex predicate source

predicate

Type: 'T -> bool

A function that evaluates to a Boolean when given an item in the sequence.

source

Type: seq<'T>

The input sequence.

Exception

Condition

ArgumentNullException

Thrown when the input sequence is null.

Returns the index of the first element in the sequence that satisfies the given predicate, or None if no such element exists.

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

Windows 7, Windows Vista SP2, Windows XP SP3, Windows XP x64 SP2, Windows Server 2008 R2, Windows Server 2008 SP2, Windows Server 2003 SP2

F# Runtime

Supported in: 2.0, 4.0

Silverlight

Supported in: 3

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