Basic Algorithm Scripting: Mutations **HELP **

Tell us what’s happening:
I am struggling to understand this exercise. I have lowercased the strings in the array and looped through to check if the second string has the index of the first string.

Where did I go wrong?

Your code so far

function mutation(arr) {
let secondArr = arr[1].toLowerCase();
let firstArr = arr[0].toLowerCase();

for(let i = 0; i < arr.length; i++){
  if(firstArr.indexOf(secondArr) != -1){
    return true;
  return false;
mutation(["hello", "hey"]);

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Challenge: Mutations

Link to the challenge:

Your if inside loop is wrong.
firstArr is hello and secondArr is hey, so the conditional is like:

'hello'.indexOf('hey') // which is always return false

If you want to loop each letter in firstArr, then you need to loop it like

for (let i = 0; i < firstArr.length; i++) {
  firstArr[i] // is h