public function testReduce()
{
$a = function () {
(yield 1);
(yield 2);
(yield 3);
};
$add = function ($a, $b) {
return $a + $b;
};
$this->assertEquals(16, P::reduce($add, 10, $a()));
$reduceByAdding = P::reduce($add, 0);
$this->assertEquals(6, $reduceByAdding($a()));
$b = ['a' => 1, 'b' => 2];
$concatKeyVals = function ($acc, $value, $key) {
return $acc . (string) $key . (string) $value;
};
$this->assertEquals('a1b2', P::reduce($concatKeyVals, '', $b));
}
