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

Parameters

• source
  Type: seq<'T>

  The input sequence.

Exceptions

Exception	Condition
ArgumentNullException	Thrown when the input sequence is null.

Return Value

The length of the sequence.

Remarks

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.

Example

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

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

See Also

Reference

Collections.Seq Module (F#)

Microsoft.FSharp.Collections Namespace (F#)