Mutation exercise. code works for oth. strings but not this one. wheres my mistake. hints have indexof() instead of RegExp constructor

JavaScript
1 
function mutation(arr) {
 let newArr=arr[1].split('')
let testThis;

 for(let i=0; i < newArr.length; i++){
    testThis = new RegExp(`${newArr[i]}`, 'i')
   if(testThis.test(arr[0])) {
       return true;
   }
   return false;
 }
}

mutation(["hello", "hey"]);
console.log(mutation(["hello", "hey"]))
4

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