Mutations Basic Algorithm Scripting

Tell us what’s happening:
What am i doing wrong can anyone please guide me thanks :slight_smile:

  **Your code so far**

function mutation(arr) {
// convering to str
let tostr = arr.toString();

// lower case
let lower = tostr.toLowerCase();

for(let i = 0; i < lower.length; i++){
if(lower.indexOf(arr[0]) === lower.indexOf(arr[1])){
return true;
return false;

mutation(["hello", "Hello"]);
  **Your browser information:**

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Challenge: Mutations

Link to the challenge:

can you please explain the logic you are using in your algorithm?

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