public function testMap()
{
$array = [1, 2, 3];
$seq = new Sequence($array);
$highLevelFunction = function ($pow) {
return function ($item) use($pow) {
return pow($item, $pow);
};
};
$filtered = $seq->map($highLevelFunction(2));
$this->assertTrue($filtered instanceof Sequence);
$this->assertEquals($array, $seq->toArray());
$this->assertEquals(3, $filtered->count());
$this->assertEquals(1, $filtered->get(0));
$this->assertEquals(4, $filtered->get(1));
$this->assertEquals(9, $filtered->get(2));
}
