Sum to N Calculator

Enter a number:

Results:

Method A (Loop)

Method B (Formula)

Method C (Recursion)

JavaScript Functions:

var sum_to_n_a = function(n) {
  let sum = 0;
  for (let i = 1; i <= n; i++) {
    sum += i;
  }
  return sum;
};

var sum_to_n_b = function(n) {
  return (n * (n + 1)) / 2;
};

var sum_to_n_c = function(n) {
  if (n <= 1) return n;
  return n + sum_to_n_c(n - 1);
};