Panagrams

function pangrams(s) {    // Write your code here   var lowerInput = s.toLowerCase();    var letterArray = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'];    for(var i = 0, l = letterArray.length; i < l; i++) {        if(lowerInput.toLowerCase().indexOf(letterArray[i]) == -1) {            console.log('not pangram');            return "not pangram";        }    }    return 'pangram';}