Ackermann Function - JS

ack.js

function ackermann(m, n) {
  var ans;
  if (m === 0) {
    ans = n + 1;
  } else if (n === 0) {
    ans = ackermann(m - 1, 1);
  } else {
    ans = ackermann(m - 1, ackermann(m, n - 1));
  }
  return ans;
}

for (var i = 0; i < 5; i++) {
  for (var j = 0; j < 5; j++) {
    console.log('ackermann (' + i + ', ' + j + ') is ' + ackermann(i,j));
  }
}