# Set.isSuperset<'T> Function (F#)

Den Delimarsky|Last Updated: 8/18/2017
|
1 Contributor

Evaluates to `true` if all elements of the second set are in the first.

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

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

## Syntax

``````// Signature:
Set.isSuperset : Set<'T> -> Set<'T> -> bool (requires comparison)

// Usage:
Set.isSuperset set1 set2
``````

#### Parameters

set1 Type: Set<'T>

The potential superset.

set2 Type: Set<'T>

The set to test against.

## Return Value

`true` if set1 is a superset of set2. Otherwise, returns `false`.

## Remarks

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

## Example

``````
let set1 = Set.ofList [ 1 .. 6 ]
let set2 = Set.ofList [ 1 .. 9 ]
let set3 = Set.ofList [ 1 .. 6 ]
let set4 = Set.ofList [ 5 .. 10 ]
printfn "%A is a superset of %A: %b" set2 set1 (Set.isSuperset set2 set1)
printfn "%A is a superset of %A: %b" set3 set1 (Set.isSuperset set3 set1)
printfn "%A is a superset of %A: %b" set4 set1 (Set.isSuperset set4 set1)
``````

Output

``````set [1; 2; 3; 4; 5; 6; 7; 8; 9] is a superset of set [1; 2; 3; 4; 5; 6]: true
set [1; 2; 3; 4; 5; 6] is a superset of set [1; 2; 3; 4; 5; 6]: true
set [5; 6; 7; 8; 9; 10] is a superset of set [1; 2; 3; 4; 5; 6]: false
``````

## 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