twoCrystallBallsProblem.ts

const twoCrystallBalls = (breaks: boolean[]): number => {
  const jumpAmount = Math.floor(Math.sqrt(breaks.length));
  let i = jumpAmount;

  for (; i < breaks.length; i += jumpAmount) {
    if (breaks[i]) {
      // so the first crystall ball has reached a ceiling point at which it breaks, we now have to chek between this point and the prior jump we did
      break;
    }
  }

  i -= jumpAmount;

  for (let j = i + 1; j <= i + jumpAmount; j++) {
    if (breaks[j]) {
      return j;
    }
  }

  return -1;
};

twoCrystallBalls([
  false,
  false,
  false,
  false,
  false,
  false,
  true,
  true,
  true,
  true,
  true,
]);

console.log(
  twoCrystallBalls([
    false,
    true,
    true,
    true,
    true,
    true,
    true,
    true,
    true,
    true,
  ])
);