README

Collection Extension for Yii 2

The yii2mod\collection\Collection class provides a fluent, convenient wrapper for working with arrays of data.

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Installation

The preferred way to install this extension is through composer.

Either run

php composer.phar require --prefer-dist yii2mod/collection "*"

or add

"yii2mod/collection": "*"

to the require section of your composer.json file.

Creating Collections

$collection = new Collection([1, 2, 3]);

// or via `make` function

$collection = Collection::make([1, 2, 3]);

Available Methods

all()
avg()
chunk()
collapse()
combine()
contains()
count()
diff()
each()
every()
except()
filter()
first()
last()
flatten()
flip()
forget()
forPage()
get()
groupBy()
has()
implode()
intersect()
isEmpty()
isNotEmpty()
keyby()
keys()
map()
max()
merge()
min()
only()
pluck()
pop()
prepend()
pull()
push()
put()
random()
reduce()
reject()
reverse()
search()
shift()
shuffle()
slice()
sort()
sortBy()
sortByDesc()
splice()
sum()
take()
toArray()
tap()
toJson()
transform()
unique()
uniqueStrict()
values()
where()
whereLoose()
whereIn()
whereInLoose()
zip()

Method Listing

`all()`

The all method simply returns the underlying array represented by the collection:

$collection = new Collection([1, 2, 3]);
$collection->all();
// [1, 2, 3]

`avg()`

The avg method returns the average of all items in the collection:

$collection = new Collection([1, 2, 3, 4, 5]);
$collection->avg();
// 3

If the collection contains nested arrays or objects, you should pass a key to use for determining which values to calculate the average:

$collection = new Collection([
    ['id' => 1, 'price' => 150],
    ['id' => 2, 'price' => 250],
]);

$collection->avg('price');

// 200

`chunk()`

The chunk method breaks the collection into multiple, smaller collections of a given size:

$collection = new Collection([1, 2, 3, 4, 5, 6, 7]);

$chunks = $collection->chunk(4);

$chunks->toArray();

// [[1, 2, 3, 4], [5, 6, 7]]

`collapse()`

The collapse method collapses a collection of arrays into a flat collection:

$collection = new Collection([[1, 2, 3], [4, 5, 6], [7, 8, 9]]);

$collapsed = $collection->collapse();

$collapsed->all();

// [1, 2, 3, 4, 5, 6, 7, 8, 9]

`combine()`

Create a collection by using this collection for keys and another for its values:

$collection = new Collection(['name', 'age']);

$combined = $collection->combine(['George', 29]);

$combined->all();

// ['name' => 'George', 'age' => 29]

`contains()`

The contains method determines whether the collection contains a given item:

$collection = new Collection(['city' => 'Alabama', 'country' => 'USA']);

$collection->contains('Alabama');

// true

$collection->contains('New York');

// false

You may also pass a key / value pair to the contains method, which will determine if the given pair exists in the collection:

$collection = new Collection([
            ['city' => 'Alabama'],
            ['city' => 'New York']
        ]);

$collection->contains('city', 'New York');

// true

`count()`

The count method returns the total number of items in the collection:

$collection = new Collection([1, 2, 3, 4, 5]);

$collection->count();

// 5

`diff()`

The diff method compares the collection against another collection or a plain PHP array:

$collection = new Collection([1, 2, 3, 4, 5]);

$diff = $collection->diff([2, 4, 6, 8]);

$diff->all();

// [1, 3, 5]

`each()`

The each method iterates over the items in the collection and passes each item to a given callback:

$collection = $collection->each(function ($item, $key) {
    if (/* some condition */) {
        return false;
    }
});

`every()`

The every method creates a new collection consisting of every n-th element:

$collection = new Collection(['a', 'b', 'c', 'd', 'e', 'f']);

$collection->every(4);

// ['a', 'e']

You may optionally pass offset as the second argument:

$collection->every(4, 1);

// ['b', 'f']

`except()`

Get all items except for those with the specified keys:

$collection = new Collection(['id' => 1, 'name' => 'Desk', 'price' => 100, 'discount' => false]);

$filtered = $collection->except(['price', 'discount']);

$filtered->all();

// ['id' => 1, 'name' => 'Desk']

For the inverse of except, see the only method.

`filter()`

The filter method filters the collection by a given callback, keeping only those items that pass a given truth test:

$collection = new Collection([1, 2, 3, 4]);

$filtered = $collection->filter(function ($value, $key) {
    return $value > 2;
});

$filtered->all();

// [3, 4]

`first()`

The first method returns the first element in the collection that passes a given truth test:

Collection::make([1, 2, 3, 4])->first(function ($key, $value) {
    return $value > 2;
});

// 3

You may also call the first method with no arguments to get the first element in the collection. If the collection is empty, null is returned:

$collection = new Collection([1, 2, 3, 4, 5]);

$collection->first();

// 1

`last()`

The last method returns the last element in the collection that passes a given truth test:

Collection::make([1, 2, 3, 4])->last(function ($key, $value) {
    return $value > 2;
});

// 4

You may also call the last method with no arguments to get the last element in the collection. If the collection is empty, null is returned:

$collection = new Collection([1, 2, 3, 4, 5]);

$collection->last();

// 5

`flatten()`

The flatten method flattens a multi-dimensional collection into a single dimension:

$collection = new Collection(['language' => 'java', 'languages' => ['php', 'javascript']]);

$collection->flatten();

// ['java', 'php', 'javascript']

`flip()`

The flip method swaps the collection's keys with their corresponding values:

$collection = new Collection(['firstName' => 'Igor', 'lastName' => 'Chepurnoy']);

$collection->flip();

// ['Igor' => 'firstName', 'Chepurnoy' => 'lastName']

`forget()`

The forget method removes an item from the collection by its key:

$collection = new Collection(['firstName' => 'Igor', 'lastName' => 'Chepurnoy']);

$collection->forget('firstName');

$collection->all();

// ['lastName' => 'Chepurnoy']

Unlike most other collection methods, forget does not return a new modified collection; it modifies the collection it is called on.

`forPage()`

The forPage method returns a new collection containing the items that would be present on a given page number:

$collection = new Collection([1, 2, 3, 4, 5, 6, 7, 8, 9]);

$chunk = $collection->forPage(2, 3);

$chunk->all();

// [4, 5, 6]

The method requires the page number and the number of items to show per page, respectively.

`get()`

Get an item from the collection by key:

$collection = new Collection([
'User' => [
    'identity' => [
        'id' => 1
    ]
]
]);

$collection->get('User.identity.id');

// 1

You may optionally pass a default value as the second argument:

$collection->get('User.identity.email', false);

// false

`groupBy()`

The groupBy method groups the collection's items by a given key:

$collection = new Collection([
     ['id' => 'id_2', 'name' => 'Bob'],
     ['id' => 'id_2', 'name' => 'John'],
     ['id' => 'id_3', 'name' => 'Frank'],
]);

$grouped = $collection->groupBy('id');

$grouped->toArray();

/*
[
    'id_2' => [
        ['id' => 'id_2', 'name' => 'Bob'],
        ['id' => 'id_2', 'name' => 'John'],
    ],
    'id_3' => [
        ['id' => 'id_3', 'name' => 'Frank'],
    ],
]
*/

In addition to passing a string key, you may also pass a callback. The callback should return the value you wish to key the group by:

$grouped = $collection->groupBy(function ($item, $key) {
    return substr($item['id'], -2);
});

/*
[
    '_2' => [
        ['id' => 'id_2', 'name' => 'Bob'],
        ['id' => 'id_2', 'name' => 'John'],
    ],
    '_3' => [
        ['id' => 'id_3', 'name' => 'Frank'],
    ],
]
*/

`has()`

The has method determines if a given key exists in the collection:

$collection = new Collection(['id' => 1, 'name' => 'Igor']);

$collection->has('id');

// true

$collection->has('email');

// false

`implode()`

Concatenate values of a given key as a string:

$collection = new Collection([
    ['account_id' => 1, 'name' => 'Ben'],
    ['account_id' => 2, 'name' => 'Bob'],
]);

$collection->implode('name', ', ');

// Ben, Bob

If the collection contains simple strings or numeric values, simply pass the "glue" as the only argument to the method:

Collection::make(['Ben', 'Bob'])->implode(' and ')

// Ben and Bob

`intersect()`

The intersect method removes any values that are not present in the given array or collection:

$collection = new Collection(['php', 'python', 'ruby']);

$intersect = $collection->intersect(['python', 'ruby', 'javascript']);

$intersect->all();

// [1 => 'python', 2 => 'ruby']

`isEmpty()`

The isEmpty method returns true if the collection is empty; otherwise, false is returned:

$collection = (new Collection([]))->isEmpty();

// true

`isNotEmpty()`

The isNotEmpty method returns true if the collection is not empty; otherwise, false is returned:

$collection = (new Collection([]))->isNotEmpty();

// false

`keyBy()`

Key an associative array by a field or using a callback:

$collection = new Collection([
    ['product_id' => '100', 'name' => 'desk'],
    ['product_id' => '200', 'name' => 'chair'],
]);

$keyed = $collection->keyBy('product_id');

$keyed->all();

/*
  [
     '100' => ['product_id' => '100', 'name' => 'desk'],
     '200' => ['product_id' => '200', 'name' => 'chair'],
  ]
*/

You may also pass your own callback, which should return the value to key the collection by:

$collection = new Collection([
    ['product_id' => '100', 'name' => 'desk'],
    ['product_id' => '200', 'name' => 'chair'],
]);

$keyed = $collection->keyBy(function ($item) {
    return strtoupper($item['name']);
});

$keyed->all();

/*
  [
    'DESK' => ['product_id' => '100', 'name' => 'desk'],
    'CHAIR' => ['product_id' => '200', 'name' => 'chair'],
  ]
*/

`keys()`

The keys method returns all of the collection's keys:

$collection = new Collection([
    'city' => 'New York',
    'country' => 'USA'
]);

$collection->keys();

// ['city', 'country']

`map()`

The map method iterates through the collection and passes each value to the given callback. The callback is free to modify the item and return it, thus forming a new collection of modified items:

$collection = new Collection([1, 2, 3, 4, 5]);

$multiplied = $collection->map(function ($item, $key) {
    return $item * 2;
});

$multiplied->all();

// [2, 4, 6, 8, 10]

Like most other collection methods, map returns a new collection instance; it does not modify the collection it is called on. If you want to transform the original collection, use the transform method.

`max()`

Get the max value of a given key:

$collection = new Collection([['foo' => 10], ['foo' => 20]]);
$max = $collection->max('foo');

// 20

$collection = new Collection([1, 2, 3, 4, 5]);
$max = $collection->max();

// 5

`merge()`

Merge the collection with the given items:

$collection = new Collection(['product_id' => 1, 'name' => 'Desk']);

$merged = $collection->merge(['price' => 100, 'discount' => false]);

$merged->all();

// ['product_id' => 1, 'name' => 'Desk', 'price' => 100, 'discount' => false]

`min()`

Get the min value of a given key:

$collection = new Collection([['foo' => 10], ['foo' => 20]]);
$min = $collection->min('foo');

// 10

$collection = new Collection([1, 2, 3, 4, 5]);
$min = $collection->min();

// 1

`only()`

The only method returns the items in the collection with the specified keys:

$collection = new Collection(['product_id' => 1, 'name' => 'Desk', 'price' => 100, 'discount' => false]);

$filtered = $collection->only(['product_id', 'name']);

$filtered->all();

// ['product_id' => 1, 'name' => 'Desk']

`pluck()`

The pluck method retrieves all of the collection values for a given key:

$collection = new Collection([
    ['product_id' => 'prod-100', 'name' => 'Desk'],
    ['product_id' => 'prod-200', 'name' => 'Chair'],
]);

$plucked = $collection->pluck('name');

$plucked->all();

// ['Desk', 'Chair']

You may also specify how you wish the resulting collection to be keyed:

$plucked = $collection->pluck('name', 'product_id');

$plucked->all();

// ['prod-100' => 'Desk', 'prod-200' => 'Chair']

`pop()`

The pop method removes and returns the last item from the collection:

$collection = new Collection([1, 2, 3, 4, 5]);

$collection->pop();
// 5

$collection->all();

// [1, 2, 3, 4]

`prepend()`

The prepend method adds an item to the beginning of the collection:

$collection = new Collection([1, 2, 3, 4, 5]);

$collection->prepend(0);

$collection->all();

// [0, 1, 2, 3, 4, 5]

You can optionally pass a second argument to set the key of the prepended item:

$collection = Collection::make(['one' => 1, 'two' => 2]);

$collection->prepend(0, 'zero');

$collection->all();

// ['zero' => 0, 'one' => 1, 'two', => 2]

`pull()`

The pull method removes and returns an item from the collection by its key:

$collection = new Collection(['product_id' => 'prod-100', 'name' => 'Desk']);

$collection->pull('name');

// 'Desk'

$collection->all();

// ['product_id' => 'prod-100']

`push()`

Push an item onto the end of the collection:

$collection = new Collection([1, 2, 3, 4]);

$collection->push(5);

$collection->all();

// [1, 2, 3, 4, 5]

`put()`

Put an item in the collection by key:

$collection = new Collection(['product_id' => 1, 'name' => 'Desk']);

$collection->put('price', 100);

$collection->all();

// ['product_id' => 1, 'name' => 'Desk', 'price' => 100]

`random()`

The random method returns a random item from the collection:

$collection = new Collection([1, 2, 3, 4, 5]);

$collection->random();

// 4 - (retrieved randomly)

You may optionally pass an integer to random. If that integer is more than 1, a collection of items is returned:

$random = $collection->random(3);

$random->all();

// [2, 4, 5] - (retrieved randomly)

`reduce()`

The reduce method reduces the collection to a single value, passing the result of each iteration into the subsequent iteration:

$collection = new Collection([1, 2, 3]);

$total = $collection->reduce(function ($carry, $item) {
    return $carry + $item;
});

// 6

The value for $carry on the first iteration is null; however, you may specify its initial value by passing a second argument to reduce:

$collection->reduce(function ($carry, $item) {
    return $carry + $item;
}, 4);

// 10

`reject()`

The reject method filters the collection using the given callback. The callback should return true for any items it wishes to remove from the resulting collection:

$collection = new Collection([1, 2, 3, 4]);

$filtered = $collection->reject(function ($value, $key) {
    return $value > 2;
});

$filtered->all();

// [1, 2]

`reverse()`

The reverse method reverses the order of the collection's items:

$collection = new Collection([1, 2, 3, 4, 5]);

$reversed = $collection->reverse();

$reversed->all();

// [5, 4, 3, 2, 1]

`search()`

Search the collection for a given value and return the corresponding key if successful:

$collection = new Collection([2, 4, 6, 8]);

$collection->search(4);

// 1

The search is done using a "loose" comparison. To use strict comparison, pass true as the second argument to the method:

$collection->search('4', true);

// false

`shift()`

The shift method removes and returns the first item from the collection:

$collection = new Collection([1, 2, 3, 4, 5]);

$collection->shift();

// 1

$collection->all();

// [2, 3, 4, 5]

`shuffle()`

Shuffle the items in the collection:

$collection = new Collection([1, 2, 3, 4, 5]);

$shuffled = $collection->shuffle();

$shuffled->all();

// [3, 2, 5, 1, 4] // (generated randomly)

`slice()`

Slice the underlying collection array:

$collection = new Collection([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);

$slice = $collection->slice(4);

$slice->all();

// [5, 6, 7, 8, 9, 10]

If you would like to limit the size of the returned slice, pass the desired size as the second argument to the method:

$slice = $collection->slice(4, 2);

$slice->all();

// [5, 6]

`sort()`

Sort through each item with a callback:

$collection = new Collection([5, 3, 1, 2, 4]);

$sorted = $collection->sort();

$sorted->values()->all();

// [1, 2, 3, 4, 5]

`sortBy()`

Sort the collection using the given callback:

$collection = new Collection([
    ['name' => 'Desk', 'price' => 200],
    ['name' => 'Chair', 'price' => 100],
    ['name' => 'Bookcase', 'price' => 150],
]);

$sorted = $collection->sortBy('price');

$sorted->values()->all();

/*
    [
        ['name' => 'Chair', 'price' => 100],
        ['name' => 'Bookcase', 'price' => 150],
        ['name' => 'Desk', 'price' => 200],
    ]
*/

You can also pass your own callback to determine how to sort the collection values:

$collection = new Collection([
    ['name' => 'Desk', 'colors' => ['Black', 'Mahogany']],
    ['name' => 'Chair', 'colors' => ['Black']],
    ['name' => 'Bookcase', 'colors' => ['Red', 'Beige', 'Brown']],
]);

$sorted = $collection->sortBy(function ($product, $key) {
    return count($product['colors']);
});

$sorted->values()->all();

/*
    [
        ['name' => 'Chair', 'colors' => ['Black']],
        ['name' => 'Desk', 'colors' => ['Black', 'Mahogany']],
        ['name' => 'Bookcase', 'colors' => ['Red', 'Beige', 'Brown']],
    ]
*/

`sortByDesc()`

This method has the same signature as the sortBy() method, but will sort the collection in the opposite order.

`splice()`

Splice a portion of the underlying collection array:

$collection = new Collection([1, 2, 3, 4, 5]);

$chunk = $collection->splice(2);

$chunk->all();

// [3, 4, 5]

$collection->all();

// [1, 2]

You may pass a second argument to limit the size of the resulting chunk:

$collection = new Collection([1, 2, 3, 4, 5]);

$chunk = $collection->splice(2, 1);

$chunk->all();

// [3]

$collection->all();

// [1, 2, 4, 5]

In addition, you can pass a third argument containing the new items to replace the items removed from the collection:

$collection = new Collection([1, 2, 3, 4, 5]);

$chunk = $collection->splice(2, 1, [10, 11]);

$chunk->all();

// [3]

$collection->all();

// [1, 2, 10, 11, 4, 5]

`sum()`

Get the sum of the given values:

$collection = new Collection([1, 2, 3]);
        
$collection->sum();

// 6

If the collection contains nested arrays or objects, you should pass a key to use for determining which values to sum:

$collection = new Collection([
    ['name' => 'Books', 'countOfProduct' => 100],
    ['name' => 'Chairs', 'countOfProduct' => 200],
]);

$collection->sum('countOfProduct');

// 300

In addition, you may pass your own callback to determine which values of the collection to sum:

$collection = new Collection([
    ['name' => 'Chair', 'colors' => ['Black']],
    ['name' => 'Desk', 'colors' => ['Black', 'Mahogany']],
    ['name' => 'Bookcase', 'colors' => ['Red', 'Beige', 'Brown']],
]);

$collection->sum(function ($product) {
    return count($product['colors']);
});

// 6

`take()`

Take the first or last {$limit} items:

$collection = new Collection([0, 1, 2, 3, 4, 5]);

$chunk = $collection->take(3);

$chunk->all();

// [0, 1, 2]

You may also pass a negative integer to take the specified amount of items from the end of the collection:

$collection = new Collection([0, 1, 2, 3, 4, 5]);

$chunk = $collection->take(-2);

$chunk->all();

// [4, 5]

`toArray()`

Get the collection of items as a plain array:

$collection = new Collection('name');

$collection->toArray();

/*
    ['name']
*/

toArray() also converts all of its nested objects to an array. If you want to get the underlying array as is, use the all() method instead.

`tap()`

The tap method passes the collection to the given callback, allowing you to "tap" into the collection at a specific point and do something with the items while not affecting the collection itself:

$collection = new Collection([2, 4, 3, 1, 5]);
$result = $collection->sort()
    ->tap(function ($collection) {
        // Values after sorting
        var_dump($collection->values()->toArray());
    })
    ->shift();
// 1

`toJson()`

Get the collection of items as JSON:

$collection = new Collection(['name' => 'Desk', 'price' => 200]);

$collection->toJson();

// '{"name":"Desk","price":200}'

`transform()`

Transform each item in the collection using a callback:

$collection = new Collection([1, 2, 3, 4, 5]);

$collection->transform(function ($item, $key) {
    return $item * 2;
});

$collection->all();

// [2, 4, 6, 8, 10]

Unlike most other collection methods, transform() modifies the collection itself. If you wish to create a new collection instead, use the map() method.

`unique()`

Return only unique items from the collection array:

$collection = new Collection([1, 1, 2, 2, 3, 4, 2]);

$unique = $collection->unique();

$unique->values()->all();

// [1, 2, 3, 4]

The returned collection keeps the original array keys. In this example we used the values() method to reset the keys to consecutively numbered indexes.

When dealing with nested arrays or objects, you may specify the key used to determine uniqueness:

$collection = new Collection([
    ['name' => 'iPhone 6', 'brand' => 'Apple', 'type' => 'phone'],
    ['name' => 'iPhone 5', 'brand' => 'Apple', 'type' => 'phone'],
    ['name' => 'Apple Watch', 'brand' => 'Apple', 'type' => 'watch'],
    ['name' => 'Galaxy S6', 'brand' => 'Samsung', 'type' => 'phone'],
    ['name' => 'Galaxy Gear', 'brand' => 'Samsung', 'type' => 'watch'],
]);

$unique = $collection->unique('brand');

$unique->values()->all();

/*
    [
        ['name' => 'iPhone 6', 'brand' => 'Apple', 'type' => 'phone'],
        ['name' => 'Galaxy S6', 'brand' => 'Samsung', 'type' => 'phone'],
    ]
*/

You may also pass your own callback to determine item uniqueness:

$unique = $collection->unique(function ($item) {
    return $item['brand'].$item['type'];
});

$unique->values()->all();

/*
    [
        ['name' => 'iPhone 6', 'brand' => 'Apple', 'type' => 'phone'],
        ['name' => 'Apple Watch', 'brand' => 'Apple', 'type' => 'watch'],
        ['name' => 'Galaxy S6', 'brand' => 'Samsung', 'type' => 'phone'],
        ['name' => 'Galaxy Gear', 'brand' => 'Samsung', 'type' => 'watch'],
    ]
*/

`uniqueStrict()`

This method has the same signature as the unique method; however, all values are compared using "strict" comparisons.

`values()`

Reset the keys on the underlying array:

$collection = new Collection([
    10 => ['product' => 'Desk', 'price' => 200],
    11 => ['product' => 'Desk', 'price' => 200]
]);

$values = $collection->values();

$values->all();

/*
    [
        0 => ['product' => 'Desk', 'price' => 200],
        1 => ['product' => 'Desk', 'price' => 200],
    ]
*/

`where()`

The where method filters the collection by a given key / value pair:

$collection = new Collection([
    ['product' => 'Desk', 'price' => 200],
    ['product' => 'Chair', 'price' => 100],
    ['product' => 'Bookcase', 'price' => 150],
    ['product' => 'Door', 'price' => 100],
]);

$filtered = $collection->where('price', 100);

$filtered->all();

/*
  [
     ['product' => 'Chair', 'price' => 100],
     ['product' => 'Door', 'price' => 100],
  ]
*/

The where() method uses strict comparisons when checking item values. Use the whereLoose method to filter using whereLoose() comparisons.

`whereLoose()`

This method has the same signature as the where() method; however, all values are compared using "loose" comparisons.

`whereIn()`

The whereIn method filters the collection by a given key / value contained within the given array.

$collection = new Collection([
    ['product' => 'Desk', 'price' => 200],
    ['product' => 'Chair', 'price' => 100],
    ['product' => 'Bookcase', 'price' => 150],
    ['product' => 'Door', 'price' => 100],
]);

$filtered = $collection->whereIn('price', [150, 200]);

$filtered->all();

/*
   [
      ['product' => 'Bookcase', 'price' => 150],
      ['product' => 'Desk', 'price' => 200],
   ]
*/

The whereIn() method uses strict comparisons when checking item values. Use the whereInLoose() method to filter using "loose" comparisons.

`whereInLoose()`

This method has the same signature as the whereIn() method; however, all values are compared using "loose" comparisons.

`zip()`

The zip method merges together the values of the given array with the values of the collection at the corresponding index:

$collection = new Collection(['Chair', 'Desk']);

$zipped = $collection->zip([100, 200]);

$zipped->all();

// [['Chair', 100], ['Desk', 200]]

yii2mod / collection

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Collection Extension for Yii 2

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Creating Collections

Available Methods

Method Listing

all()

avg()

chunk()

collapse()

combine()

contains()

count()

diff()

each()

every()

except()

filter()

first()

last()

flatten()

flip()

forget()

forPage()

get()

groupBy()

has()

implode()

intersect()

isEmpty()

isNotEmpty()

keyBy()

keys()

map()

max()

merge()

min()

only()

pluck()

pop()

prepend()

pull()

push()

put()

random()

reduce()

reject()

reverse()

search()

shift()

shuffle()

slice()

sort()

sortBy()

sortByDesc()

splice()

sum()

take()

toArray()

tap()

toJson()

transform()

unique()

uniqueStrict()

values()

where()

whereLoose()

whereIn()

whereInLoose()

zip()