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viskenxp on 02/29/12

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Last Edited at 02/29/12 09:05pm

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JavaScript Function Default Arguments (Full Object Merge)

/ Published in: JavaScript

This snippet uses jQuery.extend() to merge the objects.

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/**
 * This way we can add defaults to a function:
 * var a = function(a, b) {
 *   // code
 * }.defaults(default_a, default_b);
 */
Function.prototype.defaults = function() {
  var _f = this,
      _l = _f.length - arguments.length,
      _a = new Array(_l>0?_l:0).concat(Array.prototype.slice.apply(arguments));
 
  return function() {
    var i = 0,
        args = Array.prototype.slice.apply(arguments).concat(_a.slice(arguments.length, _a.length));
 
    for (;i < args.length; i++) {
      if ($.isPlainObject(args[i])) {
        args[i] = $.extend(true, {}, _a[i], arguments[i]);
      }
    }
 
    return _f.apply(_f, args);
  };
};