Javascript Array indexOfLeastGreaterThan(val)

/* //from   ww w  .j a v a 2 s .c o m
 * Return the index of the smallest element in the array
 * that is greater than or equal to val.
 * TODO: Be smarter if all elements are less than val.
 */
Array.prototype.indexOfLeastGreaterThan = function(val) {
 var minIndex = 0; 
 var minDist = Number.MAX_VALUE;
 for (var i = 0; i < this.length; i++) {
  if ((this[i] >= val) && (Math.abs(this[i] - val) < minDist)) {
   minDist = Math.abs(this[i] - val);
   minIndex = i;
  }
 }
 return minIndex;
}