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Added \iter\last() #101

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Added \iter\last() #101

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8dc4cfa
Added \iter\last().
Bilge May 17, 2025
c157509
Added array optimization to last().
Bilge Jun 8, 2025
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13 changes: 13 additions & 0 deletions src/iter.php
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Original file line number Diff line number Diff line change
Expand Up @@ -1290,6 +1290,19 @@ function tap(callable $function, iterable $iterable): \Iterator {
}
}

/**
* Returns the last value of the specified iterable.
*
* @param iterable $iterable Iterable.
*
* @return mixed Last value of the iterable if it contains values, otherwise null.
*/
function last(iterable $iterable): mixed {
foreach ($iterable as $value) {}

return $value ?? null;
}

/*
* Python:
* compress()
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5 changes: 5 additions & 0 deletions test/iterTest.php
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Expand Up @@ -644,6 +644,11 @@ public function testTap() {
toArray(tap([$mock, 'foo'], [1, 2, 3]))
);
}

public function testLast() {
self::assertSame(3, last(range(1, 3)));
self::assertNull(last(new \EmptyIterator()));
}
}

class _CountableTestDummy implements \Countable {
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