Collections.Map<'Key,'Value> Class (F#)
Immutable maps. Keys are ordered by F# generic comparison.
Namespace/Module Path: Microsoft.FSharp.Collections
Assembly: FSharp.Core (in FSharp.Core.dll)
[<Sealed>] type Map<[<EqualityConditionalOnAttribute>] 'Key,[<ComparisonConditionalOnAttribute>] [<EqualityConditionalOnAttribute>] 'Value (requires comparison)> = class interface IEnumerable interface IComparable interface IEnumerable interface ICollection interface IDictionary new Map : seq<'Key * 'Value> -> Map< 'Key, 'Value> member this.Add : 'Key * 'Value -> Map<'Key, 'Value> member this.ContainsKey : 'Key -> bool member this.Remove : 'Key -> Map<'Key, 'Value> member this.TryFind : 'Key -> 'Value option member this.Count : int member this.IsEmpty : bool member this.Item ('Key) : 'Value end
Maps based on generic comparison are efficient for small keys. They are not a suitable choice if keys are recursive data structures or if keys require bespoke comparison semantics. All members of this class are thread-safe and may be used concurrently from multiple threads.
This type is named FSharpMap in compiled assemblies. If you are accessing the type from a language other than F#, or through reflection, use this name.
Returns a new map with the binding added to the given map.
Tests if an element is in the domain of the map.
The number of bindings in the map.
Returns true if there are no bindings in the map.
Lookup an element in the map. Raise KeyNotFoundException if no binding exists in the map.
Removes an element from the domain of the map. No exception is raised if the element is not present.
Lookup an element in the map, returning a Some value if the element is in the domain of the map and None if not.
Windows 8, Windows 7, Windows Server 2012, Windows Server 2008 R2
F# Core Library Versions
Supported in: 2.0, 4.0, Portable