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)
Syntax
// Signature:
member this.TryFind : 'Key -> 'Value option (requires comparison)
// Usage:
map.TryFind (key)
Parameters
key Type: 'Key
The input key.
Return Value
The mapped value, or None if the key is not in the map.
Example
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.
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