trying to convert a letter to uppercase using .toUpperCase()… doesn't work?

Question

I\'m trying to convert a character in an array to uppercase using .toUpperCase(), but it doesn\'t work. I\'m pretty sure my logic is correct, so not sure why it\'s not working?<

Answer 1

The above answer is correct, however I slightly modified the code you wrote, as things can be achieved without using arrays.

var test = "hello*3";
LetterChanges(test)

function LetterChanges(str) {
var newStr = ""
 for (i = 0; i < str.length; i++) {
 var ch = str[i];
 if(ch >='A' && ch<='z'){
    ch =  String.fromCharCode(ch.charCodeAt(0) + 1);
   if(ch == 'p' || ch == 'i')
   ch = ch.toUpperCase();
   }
   newStr += ch;
 }

console.log(newStr);
return newStr;
}

Here is the fiddle : https://jsfiddle.net/fzme18q0/2/

Answer 2

console.log(tempArr[i]); //this will display "i" and "p".. why?

because you were not storing the converted value back to the variable

make it

tempArr[i] = tempArr[i].toUpperCase();