Sqrt in pure JS

sqrt.js

const guess = (x, maxRounds = 1000) => {
  let max = x / 2;
  let min = 0;
  let precision = max - min;
  let current;

  for (let i = 0; i < maxRounds; i++) {
    precision = max - min;
    current = (max - min) / 2 + min;
    const result = current * current;
    if (result === x) {
      return [current, i, 0];
    }
    if (result > x) {
      if (max === current) {
        return [current, i, precision];
      }
      max = current;
    }
    if (result < x) {
      if (min === current) {
        return [current, i, precision];
      }
      min = current;
    }
  }

  return [current, -1, precision];
};

const x = 9235345;

const messure = (fn, rounds = 1000000) => {
  const start = process.hrtime();
  for (let i = 0; i < rounds; i++) {
    fn(Math.random() * 100000);
  }
  return (process.hrtime(start)[1] / 1000000) / rounds;
};

const ownTime = messure(guess);
const buildInTime = messure(Math.sqrt);


const [result, rounds, precision] = guess(x);
console.log(`
Own result:       ${result}
Build in result:  ${Math.sqrt(x)}

Own time:         ${ownTime} ms
Build in time:    ${buildInTime} ms

Max diviation:    ${precision}
Rounds:           ${rounds}
  
Target:           ${x}
Own:              ${result * result}
Build in          ${Math.sqrt(x) * Math.sqrt(x)}
`);