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

Returns the length of the sequence

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

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

// Signature:
Seq.length : seq<'T> -> int

// Usage:
Seq.length source

source

Type: seq<'T>

The input sequence.

Exception

Condition

ArgumentNullException

Thrown when the input sequence is null.

The length of the sequence.

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

The following code shows how to use Seq.length.

let table1 = seq { for i in 1 ..10 do 
                      for j in 1 .. 10 do 
                          yield (i, j, i*j)
                 }
Seq.length table1 |> printfn "Length: %d"

Output

Length: 100

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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