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

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.

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

The following code shows how to use the TryFind method.


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."


Output

Found 2500.

Windows 7, Windows Vista SP2, Windows XP SP3, Windows XP x64 SP2, Windows Server 2008 R2, Windows Server 2008 SP2, Windows Server 2003 SP2

F# Runtime

Supported in: 2.0, 4.0

Silverlight

Supported in: 3

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