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Posted By

marcio on 02/05/10

Tagged

javascript function arguments

Versions (?)

02/05/10 02:30pm

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novatvstdios
viskenxp

 / Published in: JavaScript

 

URL: http://parentnode.org/javascript/default-arguments-in-javascript-functions/

Function.prototype.defaults = function()
{
  var _f = this;
  var _a = Array(_f.length-arguments.length).concat(
    Array.prototype.slice.apply(arguments));
  return function()
  {
    return _f.apply(_f, Array.prototype.slice.apply(arguments).concat(
      _a.slice(arguments.length, _a.length)));
  }
}
 
 
//Usage
var foo = function(a, b)
{
  ...
}.defaults(42, 'default_b');

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Posted By: viskenxp on February 29, 2012

Extended the function quickly so it does a full merge of objects: http://snipplr.com/view/63636/javascript-function-default-arguments-full-object-merge/