fastladder/fastladder

// compat
Array.prototype.forEach = Array.prototype.forEach || function(callback,thisObject){
    for(var i=0,len=this.length;i<len;i++)
        callback.call(thisObject,this[i],i,this)
};
Array.prototype.map = Array.prototype.map || function(callback,thisObject){
    for(var i=0,res=[],len=this.length;i<len;i++)
        res[i] = callback.call(thisObject,this[i],i,this);
    return res
};
Array.prototype.filter = Array.prototype.filter || function(callback,thisObject){
    for(var i=0,res=[],len=this.length;i<len;i++)
        callback.call(thisObject,this[i],i,this) && res.push(this[i]);
    return res
};
Array.prototype.indexOf = Array.prototype.indexOf || function(searchElement,fromIndex){
    var i = (fromIndex < 0) ? this.length+fromIndex : fromIndex || 0;
    for(;i<this.length;i++)
        if(searchElement === this[i]) return i;
    return -1
};
Array.prototype.lastIndexOf = Array.prototype.lastIndexOf || function(searchElement,fromIndex){
    var max = this.length-1;
    var i = (fromIndex < 0)   ? Math.max(max+1 + fromIndex,0) :
            (fromIndex > max) ? max :
            max-(fromIndex||0) || max;
    for(;i>=0;i--)
        if(searchElement === this[i]) return i;
    return -1
};
Array.prototype.every = Array.prototype.every || function(callback,thisObject){
    for(var i=0,len=this.length;i<len;i++)
        if(!callback.call(thisObject,this[i],i,this)) return false;
    return true
};
Array.prototype.some = Array.prototype.some || function(callback,thisObject){
    for(var i=0,len=this.length;i<len;i++)
        if(callback.call(thisObject,this[i],i,this)) return true;
    return false
};

// generic
if(!Array.forEach){
    (function(){
        var methods = (
            "concat slice shift push unshift pop sort reverse " +
            "forEach map filter indexOf lastIndexOf every some "
        ).split(" ");
        methods.forEach(function(mn){
            Array[mn] = Array[mn] || function(self,args){
                args = Array.prototype.slice.call(arguments,1);
                return Array.prototype[mn].apply(self,args);
            }
        });
    })();
}