CollectionExtensionsDistinctByTSource, TKey Method

public static IEnumerable<TSource> DistinctBy<TSource, TKey>(
	this IEnumerable<TSource> source,
	Func<TSource, TKey> keySelector,
	bool forwardSearch = true
)

<ExtensionAttribute>
Public Shared Function DistinctBy(Of TSource, TKey) ( 
	source As IEnumerable(Of TSource),
	keySelector As Func(Of TSource, TKey),
	Optional forwardSearch As Boolean = true
) As IEnumerable(Of TSource)

public:
[ExtensionAttribute]
generic<typename TSource, typename TKey>
static IEnumerable<TSource>^ DistinctBy(
	IEnumerable<TSource>^ source, 
	Func<TSource, TKey>^ keySelector, 
	bool forwardSearch = true
)

[<ExtensionAttribute>]
static member DistinctBy : 
        source : IEnumerable<'TSource> * 
        keySelector : Func<'TSource, 'TKey> * 
        ?forwardSearch : bool 
(* Defaults:
        let _forwardSearch = defaultArg forwardSearch true
*)
-> IEnumerable<'TSource> 

JavaScript does not support generic types or methods.