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Add duplicates function #4

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Add duplicates function #4

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7fe20ad
Adds duplicates function
Apr 7, 2020
ac6fc28
Merge pull request #1 from bramvanrijswijk/feature/add-duplicates
bramvanrijswijk Apr 7, 2020
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12 changes: 12 additions & 0 deletions src/Collection.php
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Original file line number Diff line number Diff line change
Expand Up @@ -178,6 +178,18 @@ public function unique()
return new static(array_unique($this->items, SORT_REGULAR));
}

/**
* Returns a collection with duplicate values
* @return Collection
*/
public function duplicates()
{
$unique = array_unique($this->items);
$duplicates = array_diff_assoc($this->items, $unique);

return new static($duplicates);
}

/**
* Return a new collection with the items reverese
* @return Collection
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7 changes: 7 additions & 0 deletions tests/unit/CollectionTest.php
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Expand Up @@ -195,6 +195,13 @@ public function test_unique_removes_duplicate_values()
$this->assertEquals([1, 2, 3], $unique->values()->all());
}

public function test_duplicate_values_in_collection()
{
$this->assertEquals(['Bram'], (new Collection(['Bram', 'Bram', 'John', 'Doe']))->duplicates()->values()->all());
$this->assertEquals([1, 45], (new Collection([1, 1, 2, 5, 11, 28, 45, 45, 60]))->duplicates()->values()->all());
$this->assertEquals([], (new Collection(['Bram', 'John', 'Doe', 'Jane']))->duplicates()->values()->all());
}

public function test_reverse_items_in_collection()
{
$collection = new Collection([1, 2, 3]);
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