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Returns the only element of the sequence.
Namespace/Module Path: Microsoft.FSharp.Collections.Seq
Assembly: FSharp.Core (in FSharp.Core.dll)
// Signature:
exactlyOne : seq<'T> -> 'T
// Usage:
Seq.exactlyOne source
Parameters
source
Type: seq<'T>The input sequence.
Exceptions
Exception |
Condition |
|---|---|
Thrown when the input does not have precisely one element. |
|
Thrown when the input sequence is null. |
Return Value
The last element of the sequence.
Remarks
This function is named ExactlyOne in the .NET assembly. If accessing the member from a .NET 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
.0