Solutions
Solution 1 (Click to Show/Hide)
function happy(num) {
let current_num = num;
let current_digit, sum_squares;
let num_seen = [];
// Happy process
while (current_num != 1 && num_seen[current_num] !== true) {
// Mark as seen
num_seen[current_num] = true;
// Sum squares of digits
sum_squares = 0;
while (current_num > 0) {
current_digit = current_num % 10 ;
sum_squares += current_digit * current_digit ;
current_num = (current_num - current_digit) / 10 ;
}
// Use sum as new number
current_num = sum_squares;
}
return current_num == 1;
}
