let str = "JavaScript";
        
function scramble(val) {
    let max = val.length;
    let temp = "";
    for(let i=0;i<max;i++){
        console.log(val.length);
        let index = Math.floor(Math.random() * val.length);
        temp += val[index]; 
        console.log(temp); 
        val = val.substr(0, index) + val.substr(index + 1);
        console.log(val);
    }
    return temp
}
console.log(scramble(str));