var climbStairs = function(n) { if (n == 1 || n == 0) return 1 // our base cases let first = 1; let second = 2; for (let i = 3; i <= n; i++) { let third = first + second; first = second; second = third; } return second; };
var climbStairs = function(n) { if (n == 1 || n == 0) return 1 // our base cases let first = 1; let second = 2; for (let i = 3; i <= n; i++) { let third = first + second; first = second; second = third; } return second; };