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Map.TryFind<'Key,'Value> Method (F#)

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

Lookup an element in the map, returning a Some value if the element is in the domain of the map and None if not.

Namespace/Module Path: Microsoft.FSharp.Collections

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


// Signature:
member this.TryFind : 'Key -> 'Value option (requires comparison)

// Usage:
map.TryFind (key)


key Type: 'Key

The input key.

Return Value

The mapped value, or None if the key is not in the map.


let map1 = [ for i in 1 .. 100 -> (i, i*i) ] |> Map.ofList
let result = map1.TryFind 50
match result with
| Some x -> printfn "Found %d." x
| None -> printfn "Did not find the specified value."


Found 2500.


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.Map<'Key,'Value> Class (F#)

Microsoft.FSharp.Collections Namespace (F#)

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