CollectionTrait::pluck() - Code Metrics - Inspection of "Zip, extract and transform introduced, combine ref..." - DusanKasan/Knapsack - Measure and Improve Code Quality continuously with Scrutinizer

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by Dušan

created 2016-05-02 18:27 UTC

CollectionTrait::pluck() A

↳ Parent: CollectionTrait

Complexity

Conditions	1
Paths	1

Size

Total Lines	4
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	2
CRAP Score	1

Metric	Value
dl	0
loc	4
ccs	2
cts	2
cp	1
rs	10
cc	1
eloc	2
nc	1
nop	1
crap	1

<?php

namespace DusanKasan\Knapsack;

trait CollectionTrait
{
    /**
     * Converts $collection to array. If there are multiple items with the same key, only the last will be preserved.
     *
     * @return array
     */
    public function toArray()
    {
        return toArray($this->getItems());
    }

    /**
     * Returns a lazy collection of items for which $function returned true.
     *
     * @param callable $function ($value, $key)
     * @return Collection
     */
    public function filter(callable $function)
    {
        return filter($this->getItems(), $function);
    }

    /**
     * Returns a lazy collection of distinct items. The comparison is the same as in in_array.
     *
     * @return Collection
     */
    public function distinct()
    {
        return distinct($this->getItems());
    }

    /**
     * Returns a lazy collection with items from all $collections passed as argument appended together
     *
     * @param \Traversable[]|array ...$collections
     * @return Collection
     */
    public function concat(...$collections)
    {
        return concat($this, ...$collections);
    }

    /**
     * Returns collection where each item is changed to the output of executing $function on each key/item.
     *
     * @param callable $function
     * @return Collection
     */
    public function map(callable $function)
    {
        return map($this->getItems(), $function);
    }

    /**
     * Reduces the collection to single value by iterating over the collection and calling $function while
     * passing $startValue and current key/item as parameters. The output of $function is used as $startValue in
     * next iteration. The output of $function on last element is the return value of this function.
     *
     * @param mixed $startValue
     * @param callable $function ($tmpValue, $value, $key)
     * @return mixed
     */
    public function reduce(callable $function, $startValue)
    {
        $result = reduce($this->getItems(), $function, $startValue);

        return $result;
    }

    /**
     * Returns a lazy collection with one or multiple levels of nesting flattened. Removes all nesting when no value
     * is passed.
     *
     * @param int $depth How many levels should be flatten, default (-1) is infinite.
     * @return Collection
     */
    public function flatten($depth = -1)
    {
        return flatten($this->getItems(), $depth);
    }

    /**
     * Returns a non-lazy collection sorted using $function($item1, $item2, $key1, $key2 ). $function should
     * return true if first item is larger than the second and false otherwise.
     *
     * @param callable $function ($value1, $value2, $key1, $key2)
     * @return Collection
     */
    public function sort(callable $function)
    {
        return \DusanKasan\Knapsack\sort($this->getItems(), $function);
    }

    /**
     * Returns lazy collection items of which are part of the original collection from item number $from to item
     * number $to. The items before $from are also iterated over, just not returned.
     *
     * @param int $from
     * @param int $to If omitted, will slice until end
     * @return Collection
     */
    public function slice($from, $to = -1)
    {
        return slice($this->getItems(), $from, $to);
    }

    /**
     * Returns collection which items are separated into groups indexed by the return value of $function.
     *
     * @param callable $function ($value, $key)
     * @return Collection
     */
    public function groupBy(callable $function)
    {
        return groupBy($this->getItems(), $function);
    }

    /**
     * Returns collection where items are separated into groups indexed by the value at given key.
     *
     * @param $key
     * @return Collection
     */
    public function groupByKey($key)
    {
        return groupByKey($this->getItems(), $key);
    }

    /**
     * Returns a lazy collection in which $function is executed for each item.
     *
     * @param callable $function ($value, $key)
     * @return Collection
     */
    public function each(callable $function)
    {
        return \DusanKasan\Knapsack\each($this->getItems(), $function);
    }

    /**
     * Returns the number of items in this collection.
     *
     * @return int
     */
    public function size()
    {
        return size($this->getItems());
    }

    /**
     * Returns value at the key $key. If multiple values have this key, return first. If no value has this key, throw
     * ItemNotFound. If $convertToCollection is true and the return value is a collection (array|Traversable an
     * instance of Collection will be returned.
     *
     * @param mixed $key
     * @param bool $convertToCollection
     * @return Collection|mixed
     * @throws \DusanKasan\Knapsack\Exceptions\ItemNotFound
     */
    public function get($key, $convertToCollection = false)
    {
        $result = get($this->getItems(), $key);

        return (isCollection($result) && $convertToCollection) ? new Collection($result) : $result;
    }

    /**
     * Returns item at the key $key. If multiple items have this key, return first. If no item has this key, return
     * $ifNotFound. If no value has this key, throw ItemNotFound. If $convertToCollection is true and the return value
     * is a collection (array|Traversable) an instance of Collection will be returned.
     *
     * @param mixed $key
     * @param mixed $default
     * @param bool $convertToCollection
     * @return mixed
     * @throws \DusanKasan\Knapsack\Exceptions\ItemNotFound
     */
    public function getOrDefault($key, $default = null, $convertToCollection = false)
    {
        $result = getOrDefault($this->getItems(), $key, $default);

        return (isCollection($result) && $convertToCollection) ? new Collection($result) : $result;
    }

    /**
     * Returns nth item in the collection starting from 0. If the size of this collection is smaller than $position,
     * throw ItemNotFound. If $convertToCollection is true and the return value is a collection (array|Traversable an
     * instance of Collection will be returned.
     *
     * @param int $position
     * @param bool $convertToCollection
     * @return Collection|mixed
     * @throws \DusanKasan\Knapsack\Exceptions\ItemNotFound
     */
    public function getNth($position, $convertToCollection = false)
    {
        $result = getNth($this->getItems(), $position);

        return (isCollection($result) && $convertToCollection) ? new Collection($result) : $result;
    }

    /**
     * Returns first value matched by $function. If no value matches, return $default. If $convertToCollection is true
     * and the return value is a collection (array|Traversable an instance of Collection will be returned.
     *
     * @param callable $function
     * @param mixed|null $default
     * @param bool $convertToCollection
     * @return Collection|mixed
     */
    public function find(callable $function, $default = null, $convertToCollection = false)
    {
        $result = find($this->getItems(), $function, $default);

        return (isCollection($result) && $convertToCollection) ? new Collection($result) : $result;
    }

    /**
     * Returns a non-lazy collection of items whose keys are the return values of $function and values are the number of
     * items in this collection for which the $function returned this value.
     *
     * @param callable $function
     * @return Collection
     */
    public function countBy(callable $function)
    {
        return countBy($this->getItems(), $function);
    }

    /**
     * Returns a lazy collection by changing keys of this collection for each item to the result of $function for
     * that item.
     *
     * @param callable $function
     * @return Collection
     */
    public function indexBy(callable $function)
    {
        return indexBy($this->getItems(), $function);
    }

    /**
     * Returns true if $function returns true for every item in this collection, false otherwise.
     *
     * @param callable $function
     * @return bool
     */
    public function every(callable $function)
    {
        return every($this->getItems(), $function);
    }

    /**
     * Returns true if $function returns true for at least one item in this collection, false otherwise.
     *
     * @param callable $function
     * @return bool
     */
    public function some(callable $function)
    {
        return some($this->getItems(), $function);
    }

    /**
     * Returns true if $value is present in the collection.
     *
     * @param mixed $value
     * @return bool
     */
    public function contains($value)
    {
        return contains($this->getItems(), $value);
    }

    /**
     * Returns collection of items in this collection in reverse order.
     *
     * @return Collection
     */
    public function reverse()
    {
        return reverse($this->getItems());
    }

    /**
     * Reduce the collection to single value. Walks from right to left.
     *
     * @param callable $function Must take 2 arguments, intermediate value and item from the iterator.
     * @param mixed $startValue
     * @return mixed
     */
    public function reduceRight(callable $function, $startValue)
    {
        return reduceRight($this->getItems(), $function, $startValue);
    }

    /**
     * A form of slice that returns first $numberOfItems items.
     *
     * @param int $numberOfItems
     * @return Collection
     */
    public function take($numberOfItems)
    {
        return take($this->getItems(), $numberOfItems);
    }

    /**
     * A form of slice that returns all but first $numberOfItems items.
     *
     * @param int $numberOfItems
     * @return Collection
     */
    public function drop($numberOfItems)
    {
        return drop($this->getItems(), $numberOfItems);
    }

    /**
     * Returns collection of values from this collection but with keys being numerical from 0 upwards.
     *
     * @return Collection
     */
    public function values()
    {
        return values($this->getItems());
    }

    /**
     * Returns a lazy collection without elements matched by $function.
     *
     * @param callable $function
     * @return Collection
     */
    public function reject(callable $function)
    {
        return reject($this->getItems(), $function);
    }

    /**
     * Returns a lazy collection of the keys of this collection.
     *
     * @return Collection
     */
    public function keys()
    {
        return keys($this->getItems());
    }

    /**
     * Returns a lazy collection of items of this collection separated by $separator
     *
     * @param mixed $separator
     * @return Collection
     */
    public function interpose($separator)
    {
        return interpose($this->getItems(), $separator);
    }

    /**
     * Returns a lazy collection with last $numberOfItems items skipped. These are still iterated over, just skipped.
     *
     * @param int $numberOfItems
     * @return Collection
     */
    public function dropLast($numberOfItems = 1)
    {
        return dropLast($this->getItems(), $numberOfItems);
    }

    /**
     * Returns a lazy collection of first item from first collection, first item from second, second from first and
     * so on. Accepts any number of collections.
     *
     * @param array|\Traversable ...$collections
     * @return Collection
     */
    public function interleave(...$collections)
    {
        return interleave($this->getItems(), ...$collections);
    }

    /**
     * Returns an infinite lazy collection of items in this collection repeated infinitely.
     *
     * @return Collection
     */
    public function cycle()
    {
        return cycle($this->getItems());
    }

    /**
     * Returns a lazy collection of items of this collection with $value added as first element. If $key is not provided
     * it will be next integer index.
     *
     * @param mixed $value
     * @param mixed|null $key
     * @return Collection
     */
    public function prepend($value, $key = null)
    {
        return prepend($this->getItems(), $value, $key);
    }

    /**
     * Returns a lazy collection of items of this collection with $value added as last element. If $key is not provided
     * it will be next integer index.
     *
     * @param mixed $value
     * @param mixed $key
     * @return Collection
     */
    public function append($value, $key = null)
    {
        return append($this->getItems(), $value, $key);
    }

    /**
     * Returns a lazy collection by removing items from this collection until first item for which $function returns
     * false.
     *
     * @param callable $function
     * @return Collection
     */
    public function dropWhile(callable $function)
    {
        return dropWhile($this->getItems(), $function);
    }

    /**
     * Returns a lazy collection which is a result of calling map($function) and then flatten(1)
     *
     * @param callable $function
     * @return Collection
     */
    public function mapcat(callable $function)
    {
        return mapcat($this->getItems(), $function);
    }

    /**
     * Returns a lazy collection of items from the start of the ollection until the first item for which $function
     * returns false.
     *
     * @param callable $function
     * @return Collection
     */
    public function takeWhile(callable $function)
    {
        return takeWhile($this->getItems(), $function);
    }

    /**
     * Returns a collection of [take($position), drop($position)]
     *
     * @param int $position
     * @return Collection
     */
    public function splitAt($position)
    {
        return splitAt($this->getItems(), $position);
    }

    /**
     * Returns a collection of [takeWhile($predicament), dropWhile($predicament]
     *
     * @param callable $function
     * @return Collection
     */
    public function splitWith(callable $function)
    {
        return splitWith($this->getItems(), $function);
    }

    /**
     * Returns a lazy collection with items from this collection but values that are found in keys of $replacementMap
     * are replaced by their values.
     *
     * @param \Traversable|array $replacementMap
     * @return Collection
     */
    public function replace($replacementMap)
    {
        return replace($this->getItems(), $replacementMap);
    }

    /**
     * Returns a lazy collection of reduction steps.
     *
     * @param callable $function
     * @param mixed $startValue
     * @return Collection
     */
    public function reductions(callable $function, $startValue)
    {
        return reductions($this->getItems(), $function, $startValue);
    }

    /**
     * Returns a lazy collection of every nth item in this collection
     *
     * @param int $step
     * @return Collection
     */
    public function takeNth($step)
    {
        return takeNth($this->getItems(), $step);
    }

    /**
     * Returns a non-collection of shuffled items from this collection
     *
     * @return Collection
     */
    public function shuffle()
    {
        return \DusanKasan\Knapsack\shuffle($this->getItems());
    }

    /**
     * Returns a lazy collection of collections of $numberOfItems items each, at $step step
     * apart. If $step is not supplied, defaults to $numberOfItems, i.e. the partitions
     * do not overlap. If a $padding collection is supplied, use its elements as
     * necessary to complete last partition up to $numberOfItems items. In case there are
     * not enough padding elements, return a partition with less than $numberOfItems items.
     *
     * @param int $numberOfItems
     * @param int $step
     * @param array|\Traversable $padding
     * @return Collection
     */
    public function partition($numberOfItems, $step = 0, $padding = [])
    {
        return partition($this->getItems(), $numberOfItems, $step, $padding);
    }

    /**
     * Creates a lazy collection of collections created by partitioning this collection every time $function will
     * return different result.
     *
     * @param callable $function
     * @return Collection
     */
    public function partitionBy(callable $function)
    {
        return partitionBy($this->getItems(), $function);
    }

    /**
     * Returns true if this collection is empty. False otherwise.
     *
     * @return bool
     */
    public function isEmpty()
    {
        return isEmpty($this->getItems());
    }

    /**
     * Opposite of isEmpty.
     *
     * @return bool
     */
    public function isNotEmpty()
    {
        return isNotEmpty($this->getItems());
    }

    /**
     * Returns a collection where keys are distinct items from this collection and their values are number of
     * occurrences of each value.
     *
     * @return Collection
     */
    public function frequencies()
    {
        return frequencies($this->getItems());
    }

    /**
     * Returns first item of this collection. If the collection is empty, throws ItemNotFound. If $convertToCollection
     * is true and the return value is a collection (array|Traversable an instance of Collection is returned.
     *
     * @param bool $convertToCollection
     * @return mixed|Collection
     * @throws \DusanKasan\Knapsack\Exceptions\ItemNotFound
     */
    public function first($convertToCollection = false)
    {
        $result = first($this->getItems());
        return (isCollection($result) && $convertToCollection) ? new Collection($result) : $result;
    }

    /**
     * Returns last item of this collection. If the collection is empty, throws ItemNotFound. If $convertToCollection
     * is true and the return value is a collection (array|Traversable an
     *
     * @param bool $convertToCollection
     * @return mixed|Collection
     * @throws \DusanKasan\Knapsack\Exceptions\ItemNotFound
     */
    public function last($convertToCollection = false)
    {
        $result = last($this->getItems());
        return (isCollection($result) && $convertToCollection) ? new Collection($result) : $result;
    }

    /**
     * Realizes collection - turns lazy collection into non-lazy one by iterating over it and storing the key/values.
     *
     * @return Collection
     */
    public function realize()
    {
        return realize($this->getItems());
    }

    /**
     * Returns the second item in this collection or throws ItemNotFound if the collection is empty or has 1 item.
     *
     * @return mixed
     */
    public function second()
    {
        return second($this->getItems());
    }

    /**
     * Combines the values of this collection as keys, with values of $collection as values.  The resulting collection
     * has length equal to the size of smaller collection.
     *
     * @param array|\Traversable $collection
     * @return Collection
     * @throws \DusanKasan\Knapsack\Exceptions\ItemNotFound
     */
    public function combine($collection)
    {
        return combine($this->getItems(), $collection);
    }

    /**
     * Returns a lazy collection without the items associated to any of the keys from $keys.
     *
     * @param array|\Traversable $keys
     * @return Collection
     */
    public function except($keys)
    {
        return except($this->getItems(), $keys);
    }

    /**
     * Returns a lazy collection of items associated to any of the keys from $keys.
     *
     * @param array|\Traversable $keys
     * @return Collection
     */
    public function only($keys)
    {
        return only($this->getItems(), $keys);
    }

    /**
     * Returns a lazy collection of items that are in $this but are not in any of the other arguments. Note that the
     * ...$collections are iterated non-lazily.
     *
     * @param array|\Traversable ...$collections
     * @return Collection
     */
    public function difference(...$collections)
    {
        return difference($this->getItems(), ...$collections);
    }


    /**
     * Returns a lazy collection where keys and values are flipped.
     *
     * @return Collection
     */
    public function flip()
    {
        return flip($this->getItems());
    }

    /**
     * Checks for the existence of an item with$key in this collection.
     *
     * @param mixed $key
     * @return bool
     */
    public function has($key)
    {
        return has($this->getItems(), $key);
    }

    /**
     * @return array|\Traversable
     */
    protected function getItems()
    {
        return $this;
    }
}


1		<?php
2
3		namespace DusanKasan\Knapsack;
4
5		trait CollectionTrait
6		{
7		/**
8		* Converts $collection to array. If there are multiple items with the same key, only the last will be preserved.
9		*
10		* @return array
11		*/
12	60	public function toArray()
13		{
14	60	return toArray($this->getItems());
15		}
16
17		/**
18		* Returns a lazy collection of items for which $function returned true.
19		*
20		* @param callable $function ($value, $key)
21		* @return Collection
22		*/
23	1	public function filter(callable $function)
24		{
25	1	return filter($this->getItems(), $function);
26		}
27
28		/**
29		* Returns a lazy collection of distinct items. The comparison is the same as in in_array.
30		*
31		* @return Collection
32		*/
33	1	public function distinct()
34		{
35	1	return distinct($this->getItems());
36		}
37
38		/**
39		* Returns a lazy collection with items from all $collections passed as argument appended together
40		*
41		* @param \Traversable[]\|array ...$collections
42		* @return Collection
43		*/
44	1	public function concat(...$collections)
45		{
46	1	return concat($this, ...$collections);
47		}
48
49		/**
50		* Returns collection where each item is changed to the output of executing $function on each key/item.
51		*
52		* @param callable $function
53		* @return Collection
54		*/
55	3	public function map(callable $function)
56		{
57	3	return map($this->getItems(), $function);
58		}
59
60		/**
61		* Reduces the collection to single value by iterating over the collection and calling $function while
62		* passing $startValue and current key/item as parameters. The output of $function is used as $startValue in
63		* next iteration. The output of $function on last element is the return value of this function.
64		*
65		* @param mixed $startValue
66		* @param callable $function ($tmpValue, $value, $key)
67		* @return mixed
68		*/
69	2	public function reduce(callable $function, $startValue)
70		{
71	2	$result = reduce($this->getItems(), $function, $startValue);
72
73	2	return $result;
74		}
75
76		/**
77		* Returns a lazy collection with one or multiple levels of nesting flattened. Removes all nesting when no value
78		* is passed.
79		*
80		* @param int $depth How many levels should be flatten, default (-1) is infinite.
81		* @return Collection
82		*/
83	1	public function flatten($depth = -1)
84		{
85	1	return flatten($this->getItems(), $depth);
86		}
87
88		/**
89		* Returns a non-lazy collection sorted using $function($item1, $item2, $key1, $key2 ). $function should
90		* return true if first item is larger than the second and false otherwise.
91		*
92		* @param callable $function ($value1, $value2, $key1, $key2)
93		* @return Collection
94		*/
95	1	public function sort(callable $function)
96		{
97	1	return \DusanKasan\Knapsack\sort($this->getItems(), $function);
98		}
99
100		/**
101		* Returns lazy collection items of which are part of the original collection from item number $from to item
102		* number $to. The items before $from are also iterated over, just not returned.
103		*
104		* @param int $from
105		* @param int $to If omitted, will slice until end
106		* @return Collection
107		*/
108	1	public function slice($from, $to = -1)
109		{
110	1	return slice($this->getItems(), $from, $to);
111		}
112
113		/**
114		* Returns collection which items are separated into groups indexed by the return value of $function.
115		*
116		* @param callable $function ($value, $key)
117		* @return Collection
118		*/
119	1	public function groupBy(callable $function)
120		{
121	1	return groupBy($this->getItems(), $function);
122		}
123
124		/**
125		* Returns collection where items are separated into groups indexed by the value at given key.
126		*
127		* @param $key
128		* @return Collection
129		*/
130	1	public function groupByKey($key)
131		{
132	1	return groupByKey($this->getItems(), $key);
133		}
134
135		/**
136		* Returns a lazy collection in which $function is executed for each item.
137		*
138		* @param callable $function ($value, $key)
139		* @return Collection
140		*/
141	1	public function each(callable $function)
142		{
143	1	return \DusanKasan\Knapsack\each($this->getItems(), $function);
144		}
145
146		/**
147		* Returns the number of items in this collection.
148		*
149		* @return int
150		*/
151	6	public function size()
152		{
153	6	return size($this->getItems());
154		}
155
156		/**
157		* Returns value at the key $key. If multiple values have this key, return first. If no value has this key, throw
158		* ItemNotFound. If $convertToCollection is true and the return value is a collection (array\|Traversable an
159		* instance of Collection will be returned.
160		*
161		* @param mixed $key
162		* @param bool $convertToCollection
163		* @return Collection\|mixed
164		* @throws \DusanKasan\Knapsack\Exceptions\ItemNotFound
165		*/
166	3	public function get($key, $convertToCollection = false)
167		{
168	3	$result = get($this->getItems(), $key);
169
170	3	return (isCollection($result) && $convertToCollection) ? new Collection($result) : $result;
171		}
172
173		/**
174		* Returns item at the key $key. If multiple items have this key, return first. If no item has this key, return
175		* $ifNotFound. If no value has this key, throw ItemNotFound. If $convertToCollection is true and the return value
176		* is a collection (array\|Traversable) an instance of Collection will be returned.
177		*
178		* @param mixed $key
179		* @param mixed $default
180		* @param bool $convertToCollection
181		* @return mixed
182		* @throws \DusanKasan\Knapsack\Exceptions\ItemNotFound
183		*/
184	1	public function getOrDefault($key, $default = null, $convertToCollection = false)
185		{
186	1	$result = getOrDefault($this->getItems(), $key, $default);
187
188	1	return (isCollection($result) && $convertToCollection) ? new Collection($result) : $result;
189		}
190
191		/**
192		* Returns nth item in the collection starting from 0. If the size of this collection is smaller than $position,
193		* throw ItemNotFound. If $convertToCollection is true and the return value is a collection (array\|Traversable an
194		* instance of Collection will be returned.
195		*
196		* @param int $position
197		* @param bool $convertToCollection
198		* @return Collection\|mixed
199		* @throws \DusanKasan\Knapsack\Exceptions\ItemNotFound
200		*/
201	6	public function getNth($position, $convertToCollection = false)
202		{
203	6	$result = getNth($this->getItems(), $position);
204
205	6	return (isCollection($result) && $convertToCollection) ? new Collection($result) : $result;
206		}
207
208		/**
209		* Returns first value matched by $function. If no value matches, return $default. If $convertToCollection is true
210		* and the return value is a collection (array\|Traversable an instance of Collection will be returned.
211		*
212		* @param callable $function
213		* @param mixed\|null $default
214		* @param bool $convertToCollection
215		* @return Collection\|mixed
216		*/
217	1	public function find(callable $function, $default = null, $convertToCollection = false)
218		{
219	1	$result = find($this->getItems(), $function, $default);
220
221	1	return (isCollection($result) && $convertToCollection) ? new Collection($result) : $result;
222		}
223
224		/**
225		* Returns a non-lazy collection of items whose keys are the return values of $function and values are the number of
226		* items in this collection for which the $function returned this value.
227		*
228		* @param callable $function
229		* @return Collection
230		*/
231	1	public function countBy(callable $function)
232		{
233	1	return countBy($this->getItems(), $function);
234		}
235
236		/**
237		* Returns a lazy collection by changing keys of this collection for each item to the result of $function for
238		* that item.
239		*
240		* @param callable $function
241		* @return Collection
242		*/
243	1	public function indexBy(callable $function)
244		{
245	1	return indexBy($this->getItems(), $function);
246		}
247
248		/**
249		* Returns true if $function returns true for every item in this collection, false otherwise.
250		*
251		* @param callable $function
252		* @return bool
253		*/
254	1	public function every(callable $function)
255		{
256	1	return every($this->getItems(), $function);
257		}
258
259		/**
260		* Returns true if $function returns true for at least one item in this collection, false otherwise.
261		*
262		* @param callable $function
263		* @return bool
264		*/
265	1	public function some(callable $function)
266		{
267	1	return some($this->getItems(), $function);
268		}
269
270		/**
271		* Returns true if $value is present in the collection.
272		*
273		* @param mixed $value
274		* @return bool
275		*/
276	1	public function contains($value)
277		{
278	1	return contains($this->getItems(), $value);
279		}
280
281		/**
282		* Returns collection of items in this collection in reverse order.
283		*
284		* @return Collection
285		*/
286	1	public function reverse()
287		{
288	1	return reverse($this->getItems());
289		}
290
291		/**
292		* Reduce the collection to single value. Walks from right to left.
293		*
294		* @param callable $function Must take 2 arguments, intermediate value and item from the iterator.
295		* @param mixed $startValue
296		* @return mixed
297		*/
298	2	public function reduceRight(callable $function, $startValue)
299	2	{
300	1	return reduceRight($this->getItems(), $function, $startValue);
301		}
302
303		/**
304		* A form of slice that returns first $numberOfItems items.
305		*
306		* @param int $numberOfItems
307		* @return Collection
308		*/
309	9	public function take($numberOfItems)
310		{
311	9	return take($this->getItems(), $numberOfItems);
312		}
313
314		/**
315		* A form of slice that returns all but first $numberOfItems items.
316		*
317		* @param int $numberOfItems
318		* @return Collection
319		*/
320	2	public function drop($numberOfItems)
321		{
322	2	return drop($this->getItems(), $numberOfItems);
323		}
324
325		/**
326		* Returns collection of values from this collection but with keys being numerical from 0 upwards.
327		*
328		* @return Collection
329		*/
330	8	public function values()
331		{
332	8	return values($this->getItems());
333		}
334
335		/**
336		* Returns a lazy collection without elements matched by $function.
337		*
338		* @param callable $function
339		* @return Collection
340		*/
341	1	public function reject(callable $function)
342		{
343	1	return reject($this->getItems(), $function);
344		}
345
346		/**
347		* Returns a lazy collection of the keys of this collection.
348		*
349		* @return Collection
350		*/
351	1	public function keys()
352		{
353	1	return keys($this->getItems());
354		}
355
356		/**
357		* Returns a lazy collection of items of this collection separated by $separator
358		*
359		* @param mixed $separator
360		* @return Collection
361		*/
362	1	public function interpose($separator)
363		{
364	1	return interpose($this->getItems(), $separator);
365		}
366
367		/**
368		* Returns a lazy collection with last $numberOfItems items skipped. These are still iterated over, just skipped.
369		*
370		* @param int $numberOfItems
371		* @return Collection
372		*/
373	1	public function dropLast($numberOfItems = 1)
374		{
375	1	return dropLast($this->getItems(), $numberOfItems);
376		}
377
378		/**
379		* Returns a lazy collection of first item from first collection, first item from second, second from first and
380		* so on. Accepts any number of collections.
381		*
382		* @param array\|\Traversable ...$collections
383		* @return Collection
384		*/
385	1	public function interleave(...$collections)
386		{
387	1	return interleave($this->getItems(), ...$collections);
388		}
389
390		/**
391		* Returns an infinite lazy collection of items in this collection repeated infinitely.
392		*
393		* @return Collection
394		*/
395	1	public function cycle()
396		{
397	1	return cycle($this->getItems());
398		}
399
400		/**
401		* Returns a lazy collection of items of this collection with $value added as first element. If $key is not provided
402		* it will be next integer index.
403		*
404		* @param mixed $value
405		* @param mixed\|null $key
406		* @return Collection
407		*/
408	2	public function prepend($value, $key = null)
409		{
410	2	return prepend($this->getItems(), $value, $key);
411		}
412
413		/**
414		* Returns a lazy collection of items of this collection with $value added as last element. If $key is not provided
415		* it will be next integer index.
416		*
417		* @param mixed $value
418		* @param mixed $key
419		* @return Collection
420		*/
421	8	public function append($value, $key = null)
422		{
423	8	return append($this->getItems(), $value, $key);
424		}
425
426		/**
427		* Returns a lazy collection by removing items from this collection until first item for which $function returns
428		* false.
429		*
430		* @param callable $function
431		* @return Collection
432		*/
433	1	public function dropWhile(callable $function)
434		{
435	1	return dropWhile($this->getItems(), $function);
436		}
437
438		/**
439		* Returns a lazy collection which is a result of calling map($function) and then flatten(1)
440		*
441		* @param callable $function
442		* @return Collection
443		*/
444	1	public function mapcat(callable $function)
445		{
446	1	return mapcat($this->getItems(), $function);
447		}
448
449		/**
450		* Returns a lazy collection of items from the start of the ollection until the first item for which $function
451		* returns false.
452		*
453		* @param callable $function
454		* @return Collection
455		*/
456	1	public function takeWhile(callable $function)
457		{
458	1	return takeWhile($this->getItems(), $function);
459		}
460
461		/**
462		* Returns a collection of [take($position), drop($position)]
463		*
464		* @param int $position
465		* @return Collection
466		*/
467	1	public function splitAt($position)
468		{
469	1	return splitAt($this->getItems(), $position);
470		}
471
472		/**
473		* Returns a collection of [takeWhile($predicament), dropWhile($predicament]
474		*
475		* @param callable $function
476		* @return Collection
477		*/
478	1	public function splitWith(callable $function)
479		{
480	1	return splitWith($this->getItems(), $function);
481		}
482
483		/**
484		* Returns a lazy collection with items from this collection but values that are found in keys of $replacementMap
485		* are replaced by their values.
486		*
487		* @param \Traversable\|array $replacementMap
488		* @return Collection
489		*/
490	1	public function replace($replacementMap)
491		{
492	1	return replace($this->getItems(), $replacementMap);
493		}
494
495		/**
496		* Returns a lazy collection of reduction steps.
497		*
498		* @param callable $function
499		* @param mixed $startValue
500		* @return Collection
501		*/
502	1	public function reductions(callable $function, $startValue)
503		{
504	1	return reductions($this->getItems(), $function, $startValue);
505		}
506
507		/**
508		* Returns a lazy collection of every nth item in this collection
509		*
510		* @param int $step
511		* @return Collection
512		*/
513	1	public function takeNth($step)
514		{
515	1	return takeNth($this->getItems(), $step);
516		}
517
518		/**
519		* Returns a non-collection of shuffled items from this collection
520		*
521		* @return Collection
522		*/
523	1	public function shuffle()
524		{
525	1	return \DusanKasan\Knapsack\shuffle($this->getItems());
526		}
527
528		/**
529		* Returns a lazy collection of collections of $numberOfItems items each, at $step step
530		* apart. If $step is not supplied, defaults to $numberOfItems, i.e. the partitions
531		* do not overlap. If a $padding collection is supplied, use its elements as
532		* necessary to complete last partition up to $numberOfItems items. In case there are
533		* not enough padding elements, return a partition with less than $numberOfItems items.
534		*
535		* @param int $numberOfItems
536		* @param int $step
537		* @param array\|\Traversable $padding
538		* @return Collection
539		*/
540	1	public function partition($numberOfItems, $step = 0, $padding = [])
541		{
542	1	return partition($this->getItems(), $numberOfItems, $step, $padding);
543		}
544
545		/**
546		* Creates a lazy collection of collections created by partitioning this collection every time $function will
547		* return different result.
548		*
549		* @param callable $function
550		* @return Collection
551		*/
552	1	public function partitionBy(callable $function)
553		{
554	1	return partitionBy($this->getItems(), $function);
555		}
556
557		/**
558		* Returns true if this collection is empty. False otherwise.
559		*
560		* @return bool
561		*/
562	2	public function isEmpty()
563		{
564	2	return isEmpty($this->getItems());
565		}
566
567		/**
568		* Opposite of isEmpty.
569		*
570		* @return bool
571		*/
572	2	public function isNotEmpty()
573		{
574	2	return isNotEmpty($this->getItems());
575		}
576
577		/**
578		* Returns a collection where keys are distinct items from this collection and their values are number of
579		* occurrences of each value.
580		*
581		* @return Collection
582		*/
583	1	public function frequencies()
584		{
585	1	return frequencies($this->getItems());
586		}
587
588		/**
589		* Returns first item of this collection. If the collection is empty, throws ItemNotFound. If $convertToCollection
590		* is true and the return value is a collection (array\|Traversable an instance of Collection is returned.
591		*
592		* @param bool $convertToCollection
593		* @return mixed\|Collection
594		* @throws \DusanKasan\Knapsack\Exceptions\ItemNotFound
595		*/
596	11	public function first($convertToCollection = false)
597	1	{
598	11	$result = first($this->getItems());
599	10	return (isCollection($result) && $convertToCollection) ? new Collection($result) : $result;
600		}
601
602		/**
603		* Returns last item of this collection. If the collection is empty, throws ItemNotFound. If $convertToCollection
604		* is true and the return value is a collection (array\|Traversable an
605		*
606		* @param bool $convertToCollection
607		* @return mixed\|Collection
608		* @throws \DusanKasan\Knapsack\Exceptions\ItemNotFound
609		*/
610	2	public function last($convertToCollection = false)
611		{
612	2	$result = last($this->getItems());
613	1	return (isCollection($result) && $convertToCollection) ? new Collection($result) : $result;
614		}
615
616		/**
617		* Realizes collection - turns lazy collection into non-lazy one by iterating over it and storing the key/values.
618		*
619		* @return Collection
620		*/
621	1	public function realize()
622		{
623	1	return realize($this->getItems());
624		}
625
626		/**
627		* Returns the second item in this collection or throws ItemNotFound if the collection is empty or has 1 item.
628		*
629		* @return mixed
630		*/
631	2	public function second()
632		{
633	2	return second($this->getItems());
634		}
635
636		/**
637		* Combines the values of this collection as keys, with values of $collection as values. The resulting collection
638		* has length equal to the size of smaller collection.
639		*
640		* @param array\|\Traversable $collection
641		* @return Collection
642		* @throws \DusanKasan\Knapsack\Exceptions\ItemNotFound
643		*/
644	1	public function combine($collection)
645		{
646	1	return combine($this->getItems(), $collection);
647		}
648
649		/**
650		* Returns a lazy collection without the items associated to any of the keys from $keys.
651		*
652		* @param array\|\Traversable $keys
653		* @return Collection
654		*/
655	1	public function except($keys)
656		{
657	1	return except($this->getItems(), $keys);
658		}
659
660		/**
661		* Returns a lazy collection of items associated to any of the keys from $keys.
662		*
663		* @param array\|\Traversable $keys
664		* @return Collection
665		*/
666	1	public function only($keys)
667		{
668	1	return only($this->getItems(), $keys);
669		}
670
671		/**
672		* Returns a lazy collection of items that are in $this but are not in any of the other arguments. Note that the
673		* ...$collections are iterated non-lazily.
674		*
675		* @param array\|\Traversable ...$collections
676		* @return Collection
677		*/
678	1	public function difference(...$collections)
679		{
680	1	return difference($this->getItems(), ...$collections);
681		}
682
683
684		/**
685		* Returns a lazy collection where keys and values are flipped.
686		*
687		* @return Collection
688		*/
689	1	public function flip()
690		{
691	1	return flip($this->getItems());
692		}
693
694		/**
695		* Checks for the existence of an item with$key in this collection.
696		*
697		* @param mixed $key
698		* @return bool
699		*/
700	1	public function has($key)
701		{
702	1	return has($this->getItems(), $key);
703		}
704
705		/**
706		* @return array\|\Traversable
707		*/
708	79	protected function getItems()
709		{
710	79	return $this;
711		}
712		}
713

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