JavaScript で単語を入力するのにかかる時間を計算する

const str = 'dab';

'a' -> 'd' = 3
'd' -> 'a' = 3
'a' -> 'b' = 1

const str = 'dab';
const findTimeTaken = (str = '') => {
   let timeSpent = 0;
   const keyboard = 'abcdefghijklmnopqrstuvwxyz';
   let curr = 'a';
   for(let i = 0; i < str.length; i++){
      const el = str[i];
      const fromIndex = keyboard.indexOf(curr);
      const toIndex = keyboard.indexOf(el);
      const time = Math.abs(fromIndex - toIndex);
      curr = el;
      timeSpent += time;
   };
   return timeSpent;
};
console.log(findTimeTaken(str));

7