const arr = [
  ['a', null],
  [1, undefined],
  [NaN, true],
  ['', 0],
];

const array = [];
for (let i = 0; i < 5; i++) {
  const innerArray = [];
  for (let j = 0; j < 4; j++) {
    innerArray.push(1);
  }
  array.push(innerArray);
}
console.log(array);