/**
* @param int $size
* @return SequenceInterface<SetInterface<A>>
*/
function sliding($size)
{
if ($size <= 0) {
throw new \InvalidArgumentException(sprintf('The number must be greater than 0, but got %d.', $size));
}
$slices = new Sequence();
$offset = 0;
while ($offset < $this->length()) {
$slices->add($this->createNew(array_slice($this->elements, $offset, $size)));
$offset += $size;
}
return $slices;
}
public function testMap()
{
$seq = new Sequence();
$seq->add('a');
$seq->add('b');
$self = $this;
$newSeq = $seq->map(function ($elem) use($self) {
switch ($elem) {
case 'a':
return 'c';
case 'b':
return 'd';
default:
$self->fail('Unexpected element: ' . var_export($elem, true));
}
});
$this->assertInstanceOf('Collection\\Sequence', $newSeq);
$this->assertNotSame($newSeq, $seq);
$this->assertEquals(['c', 'd'], $newSeq->all());
}