Map.partition<'Key,'T> Function (F#)
Creates two new maps, one containing the bindings for which the given predicate returns true, and the other the remaining bindings.
Namespace/Module Path: Microsoft.FSharp.Collections.Map
Assembly: FSharp.Core (in FSharp.Core.dll)
// Signature:
Map.partition : ('Key -> 'T -> bool) -> Map<'Key,'T> -> Map<'Key,'T> * Map<'Key,'T> (requires comparison)
// Usage:
Map.partition predicate table
Parameters
predicate
Type: 'Key -> 'T -> boolThe function to test the input elements.
table
Type: Map<'Key,'T>The input map.
Return Value
A pair of maps in which the first contains the elements for which the predicate returned true and the second containing the elements for which the predicated returned false.
Remarks
This function is named Partition 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 Map.partition.
let map1 = [ for i in 1..10 -> (i, i*i)] |> Map.ofList
let (mapEven, mapOdd) = Map.partition (fun key value -> key % 2 = 0) map1
printfn "Evens: %A" mapEven
printfn "Odds: %A" mapOdd
Output
Evens: map [(2, 4); (4, 16); (6, 36); (8, 64); (10, 100)] Odds: map [(1, 1); (3, 9); (5, 25); (7, 49); (9, 81)]
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