phpjs/experimental/var/unset.js

php.js offers community built php functions in javascript

function unset() {
  // http://kevin.vanzonneveld.net
  // +   original by: Brett Zamir (http://brett-zamir.me)
  // *     example 1: var arr = ['a', 'b', 'c'];
  // *     example 1: unset('arr[1]');
  // *     returns 1: undefined

  // Must pass in a STRING to indicate the variable, not the variable itself (whether or not that evaluates to a string)
  // Works only on globals
  var i = 0, arg = '', win = '', winRef = /^(?:this)?window[.[]/, arr = [], accessor = '', bracket = /\[['"]?(\d+)['"]?\]$/;
  for (i = 0; i < arguments.length; i++) {
    arg = arguments[i];
    winRef.lastIndex = 0, bracket.lastIndex = 0;
    win = winRef.test(arg) ? '' : 'this.window.';
    if (bracket.test(arg)) {
      accessor = arg.match(bracket)[1];
      arr = eval(win + arg.replace(bracket, ''));
      arr.splice(accessor, 1); // We remove from the array entirely, rather than leaving a gap
    }
    else {
      eval('delete ' + win + arg);
    }
  }
}