Use of .apply() with 'new' operator. Is this possible?

Question

In JavaScript, I want to create an object instance (via the new operator), but pass an arbitrary number of arguments to the constructor. Is this possible?

Answer 1

Any function (even a constructor) can take a variable number of arguments. Each function has an "arguments" variable which can be cast to an array with [].slice.call(arguments).

function Something(){
  this.options  = [].slice.call(arguments);

  this.toString = function (){
    return this.options.toString();
  };
}

var s = new Something(1, 2, 3, 4);
console.log( 's.options === "1,2,3,4":', (s.options == '1,2,3,4') );

var z = new Something(9, 10, 11);
console.log( 'z.options === "9,10,11":', (z.options == '9,10,11') );

The above tests produce the following output:

s.options === "1,2,3,4": true
z.options === "9,10,11": true