leetcode\HappyNumber::isHappy2()

Complexity

Conditions	4
Paths	3

Size

Total Lines	12
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

<?php
    public static function isHappy2(int $n): bool
    {
        if ($n <= 0) {
            return false;
        }
        $visited = [];
        while ($n !== 1 && ! in_array($n, $visited, true)) {
            array_push($visited, $n);
            $n = array_sum(array_map(fn ($x) => $x ** 2, str_split((string) $n)));

It seems like str_split((string)$n) can also be of type true; however, parameter $array of array_map() does only seem to accept array, maybe add an additional type check?

        }

        return !in_array($n, $visited, true);
    }