javascript apply on constructor, throwing “malformed formal parameter”

Question

thanks to wonderful responses to this question I understand how to call javascript functions with varargs.

now I\'m looking to use apply with a constructor

Answer 1

You could use apply and pass an empty object as the this argument:

var mid_parser = {};
Parser.apply(mid_parser, mid_patterns);

But that solution will not take care about the prototype chain.

You could create a Parser object, using the new operator, but without passing arguments, and then use apply to re-run the constructor function:

var mid_parser = new Parser();
Parser.apply(mid_parser, mid_patterns);