//Return true if the string in the first element of the array contains all of the letters of the string in the second element of the array.
//(ignoring case)

//MY CONVOLUTED SOLUTION
function mutation(arr) {
  //convert each array element to a separate string and change to lowercase
  let str1 = arr[0].toLowerCase();
  let str2 = arr[1].toLowerCase();
  //create new array for comparison
  let newArr = [];
   //search for second string characters in first string
  for (let i = 0; i < str2.length; i++){
    if (str1.indexOf(str2[i]) != -1){
      //add second string characters to array only if they're found in first string
      newArr.push(str2[i]);
    }
  }
  //join array elements into one string
  newArr = newArr.join('');
  //compare
  return newArr == str2;
}

mutation(["Alien", "line"]);

//MY REFACTORED SOLUTION (based on suggested solution)
function mutation(arr) {
  //convert each array element to a separate string and change to lowercase
  let str1 = arr[0].toLowerCase();
  let str2 = arr[1].toLowerCase();
  //search for second string characters in first string
  for (let i = 0; i < str2.length; i++){
    //return false if a second string character isn't found in first string
    if (str1.indexOf(str2[i]) < 0){
      return false;
    }
  }
  //return true if all second string characters are found in first string
  return true;
}
mutation(["Alien", "line"]);