AkelPad

Code: Select all

if(!Array.prototype.indexOf)
     Array.prototype.indexOf = function(searchElement, fromIndex) {
         for(var i = fromIndex||0, length = this.length; i<length; i++)
             if(this[i] == searchElement) return i;
         return -1
     };

Code: Select all

if(!Array.prototype.indexOf)
{
  Array.prototype.indexOf = function(elt /*, from*/)
  {
    var len = this.length;

    var from = Number(arguments[1]) || 0;
    from = (from < 0)
         ? Math.ceil(from)
         : Math.floor(from);
    if (from < 0)
      from += len;

    for (; from < len; from++)
    {
      if (from in this &&
          this[from] === elt)
        return from;
    }
    return -1;
  };
 }

Code: Select all

When the indexOf method is called with one or two arguments, the following steps are taken:
1. Let O be the result of calling ToObject passing the this value as the argument.
2. Let lenValue be the result of calling the [[Get]] internal method of O with the argument "length".
3. Let len be ToUint32(lenValue).
4. If len is 0, return -1.
5. If argument fromIndex was passed let n be ToInteger(fromIndex); else let n be 0.
6. If n ≥ len, return -1.
7. If n ≥ 0, then
	a. Let k be n.
8. Else, n<0
	a. Let k be len - abs(n).
	b. If k is less than 0, then let k be 0.
9. Repeat, while k<len
	a. Let kPresent be the result of calling the [[HasProperty]] internal method of O with argument ToString(k).
	b. If kPresent is true, then
		I. Let elementK be the result of calling the [[Get]] internal method of O with the argument ToString(k).
		II. Let same be the result of applying the Strict Equality Comparison Algorithm to searchElement and elementK.
		III. If same is true, return k.
	c. Increase k by 1.
10. Return -1.