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Seq.concat<'Collection,'T> Function (F#)

Den Delimarsky|Last Updated: 7/25/2016
|
1 Contributor

Combines the given enumeration-of-enumerations as a single concatenated enumeration.

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

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

Syntax

// Signature:
Seq.concat : seq<'Collection> -> seq<'T> (requires 'Collection :> seq<'T>)

// Usage:
Seq.concat sources

Parameters

sources Type: seq<'Collection>

The input enumeration-of-enumerations.

Exceptions

ExceptionCondition
ArgumentNullExceptionThrown when the input sequence is null

Return Value

The result sequence.

Remarks

The returned sequence may be passed between threads safely. However, individual IEnumerator values generated from the returned sequence should not be accessed concurrently.

This function is named Concat 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.concat.


    // Using Seq.append to append an array to a list.
    let seq1to10 = Seq.append [1; 2; 3] [| 4; 5; 6; 7; 8; 9; 10 |]
    // Using Seq.concat to concatenate a list of arrays.
    let seqResult = Seq.concat [ [| 1; 2; 3 |]; [| 4; 5; 6 |]; [|7; 8; 9|] ]
    Seq.iter (fun elem -> printf "%d " elem) seq1to10
    printfn ""
    Seq.iter (fun elem -> printf "%d " elem) seqResult

Output

1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9

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

Collections.Seq Module (F#)

Microsoft.FSharp.Collections Namespace (F#)

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