const testLen = () => {
  const rand = Math.random();
  return rand < 1 ? 4192 : rand;
}

const fillArrayWithPush = (len) => {
  const ar = [];
  for (let i = 0; i < len; i++) {
    ar.push({x: i, y: i + 1, z: i + 2, str: `str${i}`});
  }
  return ar;
};

const fillArrayWithLenConstructor = (len) => {
  const ar = new Array(len);
  for (let i = 0; i < len; i++) {
    ar[i] = {x: i, y: i + 1, z: i + 2, str: `str${i}`};
  }
  return ar;
};

const fillArrayWithLiteral = (len) => {
  const ar = [];
  for (let i = 0; i < len; i++) {
    ar[i] = {x: i, y: i + 1, z: i + 2, str: `str${i}`};
  }
  return ar;
};

const fillArrayWithSetLen = (len) => {
  const ar = [];
  ar.length = len;
  for (let i = 0; i < len; i++) {
    ar[i] = {x: i, y: i + 1, z: i + 2, str: `str${i}`};
  }
  return ar;
};