largestPalindromeProduct.js

function largestPalindromeProduct(n) {
  let palindromes = [];
  let base = Number('9'.repeat(n));

  for(let i = 1; i <= base; i++){
    for(let j = 1; j <= base; j++){
      let product = i * j;
      if (product === Number(String(product).split('').reverse().join(''))){
        palindromes.push(n)
      }
    }
  }  

  return Math.max(...palindromes);
}