public function testGroupBy()
{
$fruitOrders = TestData::$fruit;
$fnExtractFruitCountsForName = function ($fruit, $name) {
return Sequence::make($fruit)->filter(FnGen::fnCallChain(FnGen::fnPluck('name'), FnGen::fnIsEqual($name)))->values()->to_a();
};
$fruitByName = Sequence::make($fruitOrders)->groupBy(FnGen::fnPluck('name'))->to_a();
foreach ($fruitByName as $name => $orders) {
$filteredOrders = $fnExtractFruitCountsForName($fruitOrders, $name);
$this->assertEquals($filteredOrders, $orders);
}
$peopleByAge = Sequence::make(TestData::$people)->groupBy(fn\fnPluck('age'), array_fill(0, 100, array()))->toArray();
$this->assertEquals(array(), $peopleByAge[0]);
$peopleAge55 = Sequence::make(TestData::$people)->filter(fn\fnCallChain(fn\fnPluck('age'), fn\fnIsEqual(55)))->toValues();
$this->assertEquals($peopleAge55, $peopleByAge[55]);
// Test late binding of $init
$peopleByAgeFnInit = Sequence::make(TestData::$people)->groupBy(fn\fnPluck('age'), function () {
return array_fill(0, 100, array());
})->toArray();
$this->assertEquals($peopleByAge, $peopleByAgeFnInit);
}
public function testFnNotEqual()
{
$fn = FnGen::fnIsNotEqual(0);
$this->assertFalse($fn(0));
$this->assertFalse($fn('0'));
$this->assertFalse($fn(false));
$this->assertFalse($fn(null));
$this->assertFalse($fn('hello'));
// <-- sad truth about PHP.
$this->assertFalse($fn(0.0));
$this->assertTrue($fn(1));
$this->assertTrue($fn(true));
$this->assertTrue($fn('100'));
$fn = FnGen::fnIsNotEqual('hello');
$this->assertFalse($fn('hello'));
$this->assertFalse($fn(true));
// <-- also true.
$this->assertFalse($fn(0));
// <-- sad truth about PHP.
$this->assertFalse($fn(0.0));
// <-- again, sadly this is true
$this->assertTrue($fn('Hello'));
$this->assertTrue($fn('0'));
$this->assertTrue($fn(null));
$this->assertTrue($fn(false));
$fn1 = FnGen::fnIsNotEqual(0);
$fn2 = FnGen::fnIsEqual(1);
$this->assertEquals($fn1, $fn2);
// <-- closure function == closure function --- should not be relied on.
}
