public function testReduce()
{
// from js
$sum = __u::reduce(array(1, 2, 3), function ($sum, $num) {
return $sum + $num;
}, 0);
$this->assertEquals(6, $sum, 'can sum up an array');
$context = array('multiplier' => 3);
$sum = __u::reduce(array(1, 2, 3), function ($sum, $num) use($context) {
return $sum + $num * $context['multiplier'];
}, 0);
$this->assertEquals(18, $sum, 'can reduce with a context object');
$sum = __u::reduce(array(1, 2, 3), function ($sum, $num) {
return $sum + $num;
}, 0);
$this->assertEquals(6, $sum, 'default initial value');
$ifnull = null;
try {
__u::reduce(null, function () {
});
} catch (Exception $e) {
$ifnull = $e;
}
$this->assertFalse($ifnull === null, 'handles a null (without initial value) properly');
$this->assertEquals(138, __u::reduce(null, function () {
}, 138), 'handles a null (with initial value) properly');
$sum = __u(array(1, 2, 3))->reduce(function ($sum, $num) {
return $sum + $num;
});
$this->assertEquals(6, $sum, 'OO-style reduce');
$sum = __u::inject(array(1, 2, 3), function ($sum, $num) {
return $sum + $num;
}, 0);
$this->assertEquals(6, $sum, 'aliased as "inject"');
$sum = __u::foldl(array(1, 2, 3), function ($sum, $num) {
return $sum + $num;
}, 0);
$this->assertEquals(6, $sum, 'aliased as "foldl"');
// docs
$this->assertEquals(6, __u::reduce(array(1, 2, 3), function ($memo, $num) {
return $memo + $num;
}, 0));
}