function applyPredicate(elements, predicate) {
    const test = [];
    elements.forEach(el => predicate(el) ? test.push(el) : '');
    return test;
}

/* Weryfikacja */

function verify(input, goal) {
    const inputAsString = JSON.stringify(input);
    const goalAsString = JSON.stringify(goal);
    console.log(input);
    console.log(goal);
    if (inputAsString === goalAsString) {
        console.log('Gratulacje!');
    } else {
        console.log(`Niestety, oczekiwano - ${goalAsString}, otrzymano - ${inputAsString}`);
    }
}

verify(applyPredicate([1, 2, 3], element => element > 2), [3]);
verify(applyPredicate(['a', 'b', 'c'], element => ['b', 'c'].includes(element)), ['b', 'c']);
verify(applyPredicate(['x', 'y'], element => element === 'z'), []);