Hello, in this code I need to find exact place of letters, my code finds only place of one letter, but I want to find the place of 2 or more letters

Question

const f = (newStr, givenWord) => {
  let arr = [...newStr];
  let newArr = [];

  for (let i = 0; i + Math.sqrt(arr.length) < arr.length + 1; i += Math.sqrt(arr.length)) {
    newArr.push(arr.slice(i, i + Math.sqrt(arr.length)))
  }

  console.log(newArr);

  for (let i = 0; i < newArr.length; i++) {
    for (let j = 0; j < newArr[i].length; j++) {
      if (newArr[i][j] == givenWord) {
        return [i, j];
      }
    }
  }
  return [-1, -1];
};

let result = f("QWEASDZXC", "A");
console.log(`[${result[0]} ${result[1]}]`);

Answer 1

Try with this approach

(function(word, letters) {
    // Convert letters words in an array with indexes of each letter in the word
    const indexes = letters.split('').map(letter => word.indexOf(letter));
    return indexes.filter(index => index !== -1);
})('QWEASDZXC', 'AC');

Input

'QWEASDZXC' 
'AC'

Output received

[ 3, 8 ]