Reverse string algorithm

JavaScript
1

Can anyone plz explain why my code getting error; thanks

function print(msg) {
  console.log(msg);
  return msg;
}

function reverseString(str) {
  var result = "";
  for(let i=str.length; i>=0; i--) {
  result += str[i];
}
  return result;
}

print(reverseString("hello"));
//output undefinedolleh
2

The first thing you are adding to result is undefined, so str[str.length] is undefined. Why might that be? Use “hello” for example, what is “hello”[5]?

1 Like
3

undefined
I got it.
Thanks heaps

4

I saw this function today you need to add -1 to the condition for where there is let i = stri.length

5

Thanks mate i already done.

6

have you tried the split() and join() JS functions?

Answer

var v1 = str.split()
var v2 = str.reverse()
return v2.join()

7

Actually i did and complete the challenge.

8

Oh, okay. Glad to hear that.

1 Like