Array.prototype.enqueue = function(vItem) {
this.push(vItem);
};
Array.prototype.dequeue = function() {
return this.shift();
};
Array.prototype.indexOf = function (vItem) {
for (var i=0; i < this.length; i++) {
if (vItem == this[i]) {
return i;
}
}
return -1;
}
var aColors = new Array("red", "green", "yellow");
alert(aColors.indexOf("green"));