var reverseLeftWords = function (s, n) {
    let temp = [];
    for(let v of s) {
        temp.push(v);
    }
    let temp2 = [];
    let temp3 = [];
    temp.some((value,index) => {
        if ((index + 1) <= n) {
            temp2.push(value);
        } else {
            temp3.push(value);
        }
    });
    const merge = [...temp3,...temp2];
    let str = '';
    for(let v of merge) {
        str = str + v;
    }
    return str;
};