toUpperCase() is not making the string upper case

Question

I don\'t know what I\'m doing wrong; But somehow .toUpperCase() String-function is not working on my browser or do I get something wrong?

var string          


        

Answer 1

I didn't know that string is unchangeable unless your reassign it with new name

console.log(i, 'is a ' + typeof i);
var N = i.toUpperCase();
console.log(N);