Given an input N, complete the function evenNumbers() to return all even numbers in the range [0, N] in the form of an Array

Question

I'm trying to return the array containing even numbers, from 0 to a given an integer N.

My actual code is :

function evenNumbers(n) {
    let i = 0;
    while(i <= n)
    i += 2;
    var ans = [];
    ans.push(0, n%2 === 0);
    return ans;
}
module.exports = evenNumbers;
console.log(evenNumbers(6));

Output :

[0, true]

But the expected output is :

[0, 2, 4, 6]

Why evenNumbers() doesn't return the expected result?

Answer 1

1. Set ans=[] and i=0 at the beginning
2. Using a while-loop, iterate as long as i <= n
3. In each iteration, add i to ans and increment it by 2
4. In the end, after the loop finishes, return ans

function evenNumbers(n) {
  const ans = [];
  let i = 0;
  while(i <= n) { 
    ans.push(i);
    i += 2;
  }
  return ans;
}

console.log('Even numbers 0-2: ', ...evenNumbers(2));
console.log('Even numbers 0-6: ', ...evenNumbers(6));