CollectionExtensionsMaxByTSource, TKey Method

public static TSource MaxBy<TSource, TKey>(
	this IEnumerable<TSource> source,
	Func<TSource, TKey> keySelector
)
where TKey : IComparable

<ExtensionAttribute>
Public Shared Function MaxBy(Of TSource, TKey As IComparable) ( 
	source As IEnumerable(Of TSource),
	keySelector As Func(Of TSource, TKey)
) As TSource

public:
[ExtensionAttribute]
generic<typename TSource, typename TKey>
where TKey : IComparable
static TSource MaxBy(
	IEnumerable<TSource>^ source, 
	Func<TSource, TKey>^ keySelector
)

[<ExtensionAttribute>]
static member MaxBy : 
        source : IEnumerable<'TSource> * 
        keySelector : Func<'TSource, 'TKey> -> 'TSource  when 'TKey : IComparable

JavaScript does not support generic types or methods.