There is a standard library forming, largely as part of the HTML5 process, however JS-in-a-browser's 'standard' requirements are different to those of a server

There is a standard library forming, largely as part of the HTML5 process, however JS-in-a-browser's 'standard' requirements are different to those of a server or desktop application. Whats missing is simple things eg a broad range of collection types would be nice, filling some particular niches: Real dictionaries (ie, non-string (complex) keys) Sets Sorted Lists, Dictionaries, Sets Bonus points for immutable variations of all of the above (particularly if they were allowed as arguments to web workers) and for real iteration support and functional processing methods.