/**
* Map -- extracts a given field from the values.
*
* This is a alias for ->map(FnGen::fnPluck())
*
* @param string $fieldName -- name of the field to extract
* @param mixed $default = null
* @return static
*/
public function pluck($fieldName, $default = null)
{
return $this->map(FnGen::fnPluck($fieldName, $default));
}
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 testFnNestedUKeyBy()
{
$data = array(array('name' => 'Bob'), array('name' => 'Alex'), array('name' => 'Bill'), array('name' => 'Ben'), array('name' => 'Ann'), array('name' => 'Tim'), array('name' => 'Jerry'), array('name' => 'Phil'), array('name' => 'Ken'));
$fn = FnGen::fnNestedUkeyBy(FnGen::fnPluck('name'));
$expected = Sequence::make($data)->keyBy(FnGen::fnPluck('name'))->to_a();
$this->assertEquals($expected, $fn($data));
}
