collection_mystery7

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< collection_mystery6

collection_mystery8 >

Main Page → Exercises → PHP → Solve an Exercise

Language/Type: PHP collection mystery collections Stack Queue

Write the result returned by the following function when passed each of the following stacks. Your answer should be in the same notation as the input collection (a comma-separated array surrounded by [] brackets). Note: A stack displays/prints in [bottom ... top] order, and a queue displays in [front ... back] order.

function collection_mystery7($s) {
    $q = [];
    $s2 = [];

    while (count($s) > 0) {
        $n = array_pop($s);
        if ($n % 2 == 0) {
            array_push($q, $n);
        } else {
            array_push($s2, $n);
        }
    }

    while (count($q) > 0) {
        array_push($s, array_shift($q));
    }
    while (count($s2) > 0) {
        array_push($s, array_pop($s2));
    }

    return $s;
}

`[1, 2, 3, 4, 5, 6]`
`[42, 3, 12, 15, 9, 71, 88]`
`[65, 30, 10, 20, 45, 55, 6, 1]`

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