ie8_array_splice.js

var prototypeOfArray = Array.prototype;
var prototypeOfObject = Object.prototype;
var _Array_slice_ = prototypeOfArray.slice;
var array_splice = Array.prototype.splice;
ArraySplice = function(start, deleteCount) {
    var result
        , args = _Array_slice_.call(arguments, 2)
        , addElementsCount = args.length
    ;

    if (!arguments.length) {
        return [];
    }

    if (start === void 0) { // default
        start = 0;
    }
    if (deleteCount === void 0) { // default
        deleteCount = this.length - start;
    }

    if (addElementsCount > 0) {
        if (deleteCount <= 0) {
            if (start == this.length) { // tiny optimisation #1
                this.push.apply(this, args);
                return [];
            }

            if (start == 0) { // tiny optimisation #2
                this.unshift.apply(this, args);
                return [];
            }
        }

        // Array.prototype.splice implementation
        result = _Array_slice_.call(this, start, start + deleteCount);// delete part
        args.push.apply(args, _Array_slice_.call(this, start + deleteCount, this.length));// right part
        args.unshift.apply(args, _Array_slice_.call(this, 0, start));// left part

        // delete all items from this array and replace it to 'left part' + _Array_slice_.call(arguments, 2) + 'right part'
        args.unshift(0, this.length);

        array_splice.apply(this, args);

        return result;
    }

    return array_splice.call(this, start, deleteCount);
}