Main.hx

import Reverse.reverse;

class Main
{
    static function main()
    {
        var a = [1,2,3];
        for (v in reverse(a))
        {
            trace(v);
        }
    }
}

Main.js

Main.main = function() {
	var a = [1,2,3];
	var _g_array = a;
	var _g_length = a.length;
	while(_g_length > 0) {
		var v = _g_array[--_g_length];
		console.log(v);
	}
};

Reverse.hx

class Reverse<T>
{
    var array:Array<T>;
    var length:Int;

    inline function new(array:Array<T>)
    {
        this.array = array;
        this.length = array.length;
    }

    public inline function hasNext():Bool
    {
        return length > 0;
    }

    public inline function next():T
    {
        return array[--length];
    }

    public static inline function reverse<T>(array:Array<T>):Reverse<T>
    {
        return new Reverse(array);
    }
}