public function testExampleExtractKey()
{
$people = SampleDataLoader::getPeople(true);
$peopleSeq = Sequence::make($people)->keyBy(fn\fnPluck('_id'));
$keys1 = exampleExtractKeys1($peopleSeq);
$keys2 = exampleExtractKeys2($peopleSeq);
$keys3 = exampleExtractKeys3($peopleSeq);
$this->assertEquals($keys1, $keys2);
$this->assertEquals($keys2, $keys3);
}
public function testCompareMulti()
{
$values = TestData::$fruit;
usort($values, fn\fnCompareMulti(array(fn\fnCompareField('name'))));
$this->assertNotEquals(TestData::$fruit, $values);
$this->assertEquals(Sequence::make(TestData::$fruit)->pluck('name')->sort()->toValues(), array_map(fn\fnPluck('name'), $values));
$values = array(array('name' => 'Terry', 'age' => 22), array('name' => 'Bob', 'age' => 30), array('name' => 'Ann', 'age' => 30), array('name' => 'Sam', 'age' => 19), array('name' => 'Rob', 'age' => 30), array('name' => 'Robert', 'age' => 55));
$expected = array(array('name' => 'Robert', 'age' => 55), array('name' => 'Ann', 'age' => 30), array('name' => 'Bob', 'age' => 30), array('name' => 'Rob', 'age' => 30), array('name' => 'Terry', 'age' => 22), array('name' => 'Sam', 'age' => 19));
usort($values, fn\fnCompareMulti(array(fn\fnCompareFieldRev('age'), fn\fnCompareField('name'))));
$this->assertEquals($expected, $values);
}
/**
* @param array[] $employees
* @return array
*/
function exampleKeyByIdSortByEmployeeLastName2($employees)
{
$employeesSortedById = Sequence::make($employees)->keyBy(fn\fnPluck('employeeId'))->asort(fn\fnCompareField('lastName'))->to_a();
return $employeesSortedById;
}
/**
* Generate a pluck function that returns the value of a field, or null if the field does not exist.
*
* @param string $key - the name / key, of the field to get the value from.
* @param mixed $default - the default value to assign if the field does not exist.
* @return callable
*/
public static function fnPluck($key, $default = null)
{
return fn\fnPluck($key, $default);
}
/**
* Generates a function that pulls a value from a field in the document and passes it to $fnMap.
*
* @param string $fieldName
* @param Closure $fnMap($fieldValue)
* @return Closure
*/
function fnMapFromField($fieldName, $fnMap)
{
return fn\fnPipe(fn\fnPluck($fieldName), $fnMap);
}
