SOURCE

Array.prototype.bubble = function() {
    let _this = this;
    for (let i = 0; i < _this.length - 1; i++) {
        for (let j = 0; j < _this.length - 1 - i; j++) {
            if (_this[j] > _this[j + 1]) {
                let temp = _this[j + 1];
                _this[j + 1] = _this[j];
                _this[j] = temp;
            }
        }
    }
    return _this
}

let arr = [4, 56, 1, 89]
console.log(arr.bubble())