MuCTS\Collections\LazyCollection

Complexity

Total Complexity

193

Size/Duplication

Total Lines	1363
Duplicated Lines	0 %

Importance

Changes	1
Bugs	0	Features	0

80 Methods

Rating	Name	Duplication	Size	Complexity
A	remember()	0	29	5
A	replace()	0	17	4
A	passthru()	0	4	1
A	last()	0	11	5
A	sortByDesc()	0	3	1
A	shuffle()	0	3	1
A	zip()	0	13	2
A	mode()	0	3	1
A	merge()	0	3	1
A	avg()	0	3	1
A	__construct()	0	8	4
A	sortDesc()	0	3	1
A	flatten()	0	15	5
A	map()	0	5	2
A	get()	0	13	4
A	mergeRecursive()	0	3	1
A	replaceRecursive()	0	3	1
A	sortKeys()	0	3	1
A	intersect()	0	3	1
A	skipUntil()	0	5	2
A	filter()	0	12	4
A	mapToDictionary()	0	3	1
A	pad()	0	17	4
A	random()	0	5	2
A	empty()	0	3	1
A	split()	0	3	1
A	explodePluckParameters()	0	7	4
A	crossJoin()	0	3	1
A	search()	0	15	5
A	join()	0	3	1
A	collapse()	0	7	5
A	sortKeysDesc()	0	3	1
A	keyBy()	0	13	3
A	chunk()	0	29	6
A	diffUsing()	0	3	1
A	mapWithKeys()	0	5	2
A	eager()	0	3	1
A	diffAssocUsing()	0	3	1
A	range()	0	5	2
A	flip()	0	5	2
A	sortBy()	0	3	1
A	countBy()	0	20	4
A	nth()	0	11	3
A	duplicates()	0	3	1
A	getIterator()	0	3	1
A	takeUntil()	0	11	4
A	count()	0	7	2
A	combine()	0	21	4
A	implode()	0	3	1
A	times()	0	13	4
A	groupBy()	0	3	1
A	median()	0	3	1
A	keys()	0	5	2
A	diffAssoc()	0	3	1
B	only()	0	22	8
A	duplicatesStrict()	0	3	1
A	contains()	0	21	6
A	diff()	0	3	1
A	all()	0	7	2
A	takeWhile()	0	6	2
A	take()	0	18	5
A	except()	0	3	1
A	slice()	0	9	4
A	skip()	0	13	4
A	tapEach()	0	7	2
A	intersectByKeys()	0	3	1
A	reverse()	0	3	1
A	pluck()	0	18	5
A	concat()	0	6	1
A	sort()	0	3	1
A	has()	0	12	5
A	diffKeys()	0	3	1
A	diffKeysUsing()	0	3	1
A	reduce()	0	9	2
A	values()	0	5	2
A	isEmpty()	0	3	1
A	union()	0	3	1
A	first()	0	19	5
A	makeIterator()	0	11	3
A	skipWhile()	0	15	5

<?php

namespace MuCTS\Collections;

use ArrayIterator;
use Closure;
use MuCTS\Collections\Traits\EnumeratesValues;
use MuCTS\Contracts\Collections\Enumerable;
use MuCTS\Macroable\Traits\Macroable;
use IteratorAggregate;
use stdClass;

class LazyCollection implements Enumerable
{
    use EnumeratesValues, Macroable;

The trait MuCTS\Macroable\Traits\Macroable requires the property $name which is not provided by MuCTS\Collections\LazyCollection.

    /**
     * The source from which to generate items.
     *
     * @var callable|static
     */
    public $source;

    /**
     * Create a new lazy collection instance.
     *
     * @param mixed $source
     * @return void
     */
    public function __construct($source = null)
    {
        if ($source instanceof Closure || $source instanceof self) {
            $this->source = $source;
        } elseif (is_null($source)) {
            $this->source = static::empty();
        } else {
            $this->source = $this->getArrayableItems($source);
        }
    }

    /**
     * Create a new instance with no items.
     *
     * @return static
     */
    public static function empty()
    {
        return new static([]);
    }

    /**
     * Create a new instance by invoking the callback a given amount of times.
     *
     * @param int $number
     * @param callable|null $callback
     * @return static
     */
    public static function times($number, callable $callback = null)
    {
        if ($number < 1) {
            return new static;
        }

        $instance = new static(function () use ($number) {
            for ($current = 1; $current <= $number; $current++) {
                yield $current;
            }
        });

        return is_null($callback) ? $instance : $instance->map($callback);
    }

    /**
     * Create an enumerable with the given range.
     *
     * @param int $from
     * @param int $to
     * @return static
     */
    public static function range($from, $to)
    {
        return new static(function () use ($from, $to) {
            for (; $from <= $to; $from++) {
                yield $from;
            }
        });
    }

    /**
     * Get all items in the enumerable.
     *
     * @return array
     */
    public function all()
    {
        if (is_array($this->source)) {
            return $this->source;
        }

        return iterator_to_array($this->getIterator());
    }

    /**
     * Eager load all items into a new lazy collection backed by an array.
     *
     * @return static
     */
    public function eager()
    {
        return new static($this->all());
    }

    /**
     * Cache values as they're enumerated.
     *
     * @return static
     */
    public function remember()
    {
        $iterator = $this->getIterator();

        $iteratorIndex = 0;

        $cache = [];

        return new static(function () use ($iterator, &$iteratorIndex, &$cache) {
            for ($index = 0; true; $index++) {
                if (array_key_exists($index, $cache)) {
                    yield $cache[$index][0] => $cache[$index][1];

                    continue;
                }

                if ($iteratorIndex < $index) {
                    $iterator->next();

The method next() does not exist on Traversable. It seems like you code against a sub-type of Traversable such as IntlCodePointBreakIterator or Yaf_Config_Simple or Yaf\Session or IntlRuleBasedBreakIterator or Yaf_Session or Yaf\Config\Simple or Yaf\Config\Ini or Iterator or Yaf_Config_Ini or IntlBreakIterator or MongoGridFSCursor or Doctrine\Common\Collections\Collection or MuCTS\Collections\Collection or MuCTS\Collections\LazyCollection or Symfony\Component\Form\Test\FormInterface or SimpleXMLIterator or Symfony\Component\Form\Test\FormBuilderInterface.

                    $iteratorIndex++;
                }

                if (!$iterator->valid()) {

The method valid() does not exist on Traversable. It seems like you code against a sub-type of Traversable such as Yaf_Config_Simple or Yaf\Session or Yaf_Session or Yaf\Config\Simple or Yaf\Config\Ini or Iterator or Yaf_Config_Ini or MongoGridFSCursor or MuCTS\Collections\Collection or MuCTS\Collections\LazyCollection or Symfony\Component\Form\Test\FormInterface or SimpleXMLIterator or Symfony\Component\Form\Test\FormBuilderInterface.

                    break;
                }

                $cache[$index] = [$iterator->key(), $iterator->current()];

The method current() does not exist on Traversable. It seems like you code against a sub-type of Traversable such as IntlCodePointBreakIterator or Yaf_Config_Simple or Yaf\Session or IntlRuleBasedBreakIterator or Yaf_Session or Yaf\Config\Simple or Yaf\Config\Ini or Iterator or Yaf_Config_Ini or IntlBreakIterator or MongoGridFSCursor or Doctrine\Common\Collections\Collection or MuCTS\Collections\Collection or MuCTS\Collections\LazyCollection or Symfony\Component\Form\Test\FormInterface or SimpleXMLIterator or Symfony\Component\Form\Test\FormBuilderInterface.

The method key() does not exist on Traversable. It seems like you code against a sub-type of Traversable such as Yaf_Config_Simple or Yaf\Session or Yaf_Session or Yaf\Config\Simple or Yaf\Config\Ini or Iterator or Yaf_Config_Ini or MongoGridFSCursor or Doctrine\Common\Collections\Collection or MuCTS\Collections\Collection or MuCTS\Collections\LazyCollection or Symfony\Component\Form\Test\FormInterface or SimpleXMLIterator or Symfony\Component\Form\Test\FormBuilderInterface.

                yield $cache[$index][0] => $cache[$index][1];
            }
        });
    }

    /**
     * Get the average value of a given key.
     *
     * @param callable|string|null $callback
     * @return mixed
     */
    public function avg($callback = null)
    {
        return $this->collect()->avg($callback);
    }

    /**
     * Get the median of a given key.
     *
     * @param string|array|null $key
     * @return mixed
     */
    public function median($key = null)
    {
        return $this->collect()->median($key);
    }

    /**
     * Get the mode of a given key.
     *
     * @param string|array|null $key
     * @return array|null
     */
    public function mode($key = null)
    {
        return $this->collect()->mode($key);
    }

    /**
     * Collapse the collection of items into a single array.
     *
     * @return static
     */
    public function collapse()
    {
        return new static(function () {
            foreach ($this as $values) {
                if (is_array($values) || $values instanceof Enumerable) {
                    foreach ($values as $value) {
                        yield $value;
                    }
                }
            }
        });
    }

    /**
     * Determine if an item exists in the enumerable.
     *
     * @param mixed $key
     * @param mixed $operator
     * @param mixed $value
     * @return bool
     */
    public function contains($key, $operator = null, $value = null)
    {
        if (func_num_args() === 1 && $this->useAsCallable($key)) {
            $placeholder = new stdClass;

            return $this->first($key, $placeholder) !== $placeholder;
        }

        if (func_num_args() === 1) {
            $needle = $key;

            foreach ($this as $value) {
                if ($value == $needle) {
                    return true;
                }
            }

            return false;
        }

        return $this->contains($this->operatorForWhere(...func_get_args()));

func_get_args() is expanded, but the parameter $key of MuCTS\Collections\LazyCollection::operatorForWhere() does not expect variable arguments.

    }

    /**
     * Cross join the given iterables, returning all possible permutations.
     *
     * @param array ...$arrays
     * @return static
     */
    public function crossJoin(...$arrays)
    {
        return $this->passthru('crossJoin', func_get_args());
    }

    /**
     * Count the number of items in the collection by a field or using a callback.
     *
     * @param callable|string $countBy
     * @return static
     */
    public function countBy($countBy = null)
    {
        $countBy = is_null($countBy)
            ? $this->identity()
            : $this->valueRetriever($countBy);

        return new static(function () use ($countBy) {
            $counts = [];

            foreach ($this as $key => $value) {
                $group = $countBy($value, $key);

                if (empty($counts[$group])) {
                    $counts[$group] = 0;
                }

                $counts[$group]++;
            }

            yield from $counts;
        });
    }

    /**
     * Get the items that are not present in the given items.
     *
     * @param mixed $items
     * @return static
     */
    public function diff($items)
    {
        return $this->passthru('diff', func_get_args());
    }

    /**
     * Get the items that are not present in the given items, using the callback.
     *
     * @param mixed $items
     * @param callable $callback
     * @return static
     */
    public function diffUsing($items, callable $callback)
    {
        return $this->passthru('diffUsing', func_get_args());
    }

    /**
     * Get the items whose keys and values are not present in the given items.
     *
     * @param mixed $items
     * @return static
     */
    public function diffAssoc($items)
    {
        return $this->passthru('diffAssoc', func_get_args());
    }

    /**
     * Get the items whose keys and values are not present in the given items, using the callback.
     *
     * @param mixed $items
     * @param callable $callback
     * @return static
     */
    public function diffAssocUsing($items, callable $callback)
    {
        return $this->passthru('diffAssocUsing', func_get_args());
    }

    /**
     * Get the items whose keys are not present in the given items.
     *
     * @param mixed $items
     * @return static
     */
    public function diffKeys($items)
    {
        return $this->passthru('diffKeys', func_get_args());
    }

    /**
     * Get the items whose keys are not present in the given items, using the callback.
     *
     * @param mixed $items
     * @param callable $callback
     * @return static
     */
    public function diffKeysUsing($items, callable $callback)
    {
        return $this->passthru('diffKeysUsing', func_get_args());
    }

    /**
     * Retrieve duplicate items.
     *
     * @param callable|null $callback
     * @param bool $strict
     * @return static
     */
    public function duplicates($callback = null, $strict = false)
    {
        return $this->passthru('duplicates', func_get_args());
    }

    /**
     * Retrieve duplicate items using strict comparison.
     *
     * @param callable|null $callback
     * @return static
     */
    public function duplicatesStrict($callback = null)
    {
        return $this->passthru('duplicatesStrict', func_get_args());
    }

    /**
     * Get all items except for those with the specified keys.
     *
     * @param mixed $keys
     * @return static
     */
    public function except($keys)
    {
        return $this->passthru('except', func_get_args());
    }

    /**
     * Run a filter over each of the items.
     *
     * @param callable|null $callback
     * @return static
     */
    public function filter(callable $callback = null)
    {
        if (is_null($callback)) {
            $callback = function ($value) {
                return (bool)$value;
            };
        }

        return new static(function () use ($callback) {
            foreach ($this as $key => $value) {
                if ($callback($value, $key)) {
                    yield $key => $value;
                }
            }
        });
    }

    /**
     * Get the first item from the enumerable passing the given truth test.
     *
     * @param callable|null $callback
     * @param mixed $default
     * @return mixed
     */
    public function first(callable $callback = null, $default = null)
    {
        $iterator = $this->getIterator();

        if (is_null($callback)) {
            if (!$iterator->valid()) {
                return value($default);
            }

            return $iterator->current();
        }

        foreach ($iterator as $key => $value) {
            if ($callback($value, $key)) {
                return $value;
            }
        }

        return value($default);
    }

    /**
     * Get a flattened list of the items in the collection.
     *
     * @param int $depth
     * @return static
     */
    public function flatten($depth = INF)
    {
        $instance = new static(function () use ($depth) {
            foreach ($this as $item) {
                if (!is_array($item) && !$item instanceof Enumerable) {
                    yield $item;
                } elseif ($depth === 1) {
                    yield from $item;
                } else {
                    yield from (new static($item))->flatten($depth - 1);

$depth - 1 of type double is incompatible with the type integer expected by parameter $depth of MuCTS\Collections\LazyCollection::flatten().

                }
            }
        });

        return $instance->values();
    }

    /**
     * Flip the items in the collection.
     *
     * @return static
     */
    public function flip()
    {
        return new static(function () {
            foreach ($this as $key => $value) {
                yield $value => $key;
            }
        });
    }

    /**
     * Get an item by key.
     *
     * @param mixed $key
     * @param mixed $default
     * @return mixed
     */
    public function get($key, $default = null)
    {
        if (is_null($key)) {
            return null;
        }

        foreach ($this as $outerKey => $outerValue) {
            if ($outerKey == $key) {
                return $outerValue;
            }
        }

        return value($default);
    }

    /**
     * Group an associative array by a field or using a callback.
     *
     * @param array|callable|string $groupBy
     * @param bool $preserveKeys
     * @return static
     */
    public function groupBy($groupBy, $preserveKeys = false)
    {
        return $this->passthru('groupBy', func_get_args());
    }

    /**
     * Key an associative array by a field or using a callback.
     *
     * @param callable|string $keyBy
     * @return static
     */
    public function keyBy($keyBy)
    {
        return new static(function () use ($keyBy) {
            $keyBy = $this->valueRetriever($keyBy);

            foreach ($this as $key => $item) {
                $resolvedKey = $keyBy($item, $key);

                if (is_object($resolvedKey)) {
                    $resolvedKey = (string)$resolvedKey;
                }

                yield $resolvedKey => $item;
            }
        });
    }

    /**
     * Determine if an item exists in the collection by key.
     *
     * @param mixed $key
     * @return bool
     */
    public function has($key)
    {
        $keys = array_flip(is_array($key) ? $key : func_get_args());
        $count = count($keys);

        foreach ($this as $key => $value) {

$key is overwriting one of the parameters of this function.

            if (array_key_exists($key, $keys) && --$count == 0) {
                return true;
            }
        }

        return false;
    }

    /**
     * Concatenate values of a given key as a string.
     *
     * @param string $value
     * @param string|null $glue
     * @return string
     */
    public function implode($value, $glue = null)
    {
        return $this->collect()->implode(...func_get_args());

func_get_args() is expanded, but the parameter $value of MuCTS\Collections\Collection::implode() does not expect variable arguments.

    }

    /**
     * Intersect the collection with the given items.
     *
     * @param mixed $items
     * @return static
     */
    public function intersect($items)
    {
        return $this->passthru('intersect', func_get_args());
    }

    /**
     * Intersect the collection with the given items by key.
     *
     * @param mixed $items
     * @return static
     */
    public function intersectByKeys($items)
    {
        return $this->passthru('intersectByKeys', func_get_args());
    }

    /**
     * Determine if the items is empty or not.
     *
     * @return bool
     */
    public function isEmpty()
    {
        return !$this->getIterator()->valid();
    }

    /**
     * Join all items from the collection using a string. The final items can use a separate glue string.
     *
     * @param string $glue
     * @param string $finalGlue
     * @return string
     */
    public function join($glue, $finalGlue = '')
    {
        return $this->collect()->join(...func_get_args());

func_get_args() is expanded, but the parameter $glue of MuCTS\Collections\Collection::join() does not expect variable arguments.

    }

    /**
     * Get the keys of the collection items.
     *
     * @return static
     */
    public function keys()
    {
        return new static(function () {
            foreach ($this as $key => $value) {
                yield $key;
            }
        });
    }

    /**
     * Get the last item from the collection.
     *
     * @param callable|null $callback
     * @param mixed $default
     * @return mixed
     */
    public function last(callable $callback = null, $default = null)
    {
        $needle = $placeholder = new stdClass;

        foreach ($this as $key => $value) {
            if (is_null($callback) || $callback($value, $key)) {
                $needle = $value;
            }
        }

        return $needle === $placeholder ? value($default) : $needle;
    }

    /**
     * Get the values of a given key.
     *
     * @param string|array $value
     * @param string|null $key
     * @return static
     */
    public function pluck($value, $key = null)
    {
        return new static(function () use ($value, $key) {
            [$value, $key] = $this->explodePluckParameters($value, $key);

            foreach ($this as $item) {
                $itemValue = data_get($item, $value);

                if (is_null($key)) {
                    yield $itemValue;
                } else {
                    $itemKey = data_get($item, $key);

                    if (is_object($itemKey) && method_exists($itemKey, '__toString')) {
                        $itemKey = (string)$itemKey;
                    }

                    yield $itemKey => $itemValue;
                }
            }
        });
    }

    /**
     * Run a map over each of the items.
     *
     * @param callable $callback
     * @return static
     */
    public function map(callable $callback)
    {
        return new static(function () use ($callback) {
            foreach ($this as $key => $value) {
                yield $key => $callback($value, $key);
            }
        });
    }

    /**
     * Run a dictionary map over the items.
     *
     * The callback should return an associative array with a single key/value pair.
     *
     * @param callable $callback
     * @return static
     */
    public function mapToDictionary(callable $callback)
    {
        return $this->passthru('mapToDictionary', func_get_args());
    }

    /**
     * Run an associative map over each of the items.
     *
     * The callback should return an associative array with a single key/value pair.
     *
     * @param callable $callback
     * @return static
     */
    public function mapWithKeys(callable $callback)
    {
        return new static(function () use ($callback) {
            foreach ($this as $key => $value) {
                yield from $callback($value, $key);
            }
        });
    }

    /**
     * Merge the collection with the given items.
     *
     * @param mixed $items
     * @return static
     */
    public function merge($items)
    {
        return $this->passthru('merge', func_get_args());
    }

    /**
     * Recursively merge the collection with the given items.
     *
     * @param mixed $items
     * @return static
     */
    public function mergeRecursive($items)
    {
        return $this->passthru('mergeRecursive', func_get_args());
    }

    /**
     * Create a collection by using this collection for keys and another for its values.
     *
     * @param mixed $values
     * @return static
     */
    public function combine($values)
    {
        return new static(function () use ($values) {
            $values = $this->makeIterator($values);

            $errorMessage = 'Both parameters should have an equal number of elements';

            foreach ($this as $key) {
                if (!$values->valid()) {
                    trigger_error($errorMessage, E_USER_WARNING);

                    break;
                }

                yield $key => $values->current();

                $values->next();
            }

            if ($values->valid()) {
                trigger_error($errorMessage, E_USER_WARNING);
            }
        });
    }

    /**
     * Union the collection with the given items.
     *
     * @param mixed $items
     * @return static
     */
    public function union($items)
    {
        return $this->passthru('union', func_get_args());
    }

    /**
     * Create a new collection consisting of every n-th element.
     *
     * @param int $step
     * @param int $offset
     * @return static
     */
    public function nth($step, $offset = 0)
    {
        return new static(function () use ($step, $offset) {
            $position = 0;

            foreach ($this as $item) {
                if ($position % $step === $offset) {
                    yield $item;
                }

                $position++;
            }
        });
    }

    /**
     * Get the items with the specified keys.
     *
     * @param mixed $keys
     * @return static
     */
    public function only($keys)
    {
        if ($keys instanceof Enumerable) {
            $keys = $keys->all();
        } elseif (!is_null($keys)) {
            $keys = is_array($keys) ? $keys : func_get_args();
        }

        return new static(function () use ($keys) {
            if (is_null($keys)) {
                yield from $this;
            } else {
                $keys = array_flip($keys);

                foreach ($this as $key => $value) {
                    if (array_key_exists($key, $keys)) {
                        yield $key => $value;

                        unset($keys[$key]);

                        if (empty($keys)) {
                            break;
                        }
                    }
                }
            }
        });
    }

    /**
     * Push all of the given items onto the collection.
     *
     * @param iterable $source
     * @return static
     */
    public function concat($source)
    {
        return (new static(function () use ($source) {
            yield from $this;
            yield from $source;
        }))->values();
    }

    /**
     * Get one or a specified number of items randomly from the collection.
     *
     * @param int|null $number
     * @return static|mixed
     *
     * @throws \InvalidArgumentException
     */
    public function random($number = null)
    {
        $result = $this->collect()->random(...func_get_args());

func_get_args() is expanded, but the parameter $number of MuCTS\Collections\Collection::random() does not expect variable arguments.

        return is_null($number) ? $result : new static($result);
    }

    /**
     * Reduce the collection to a single value.
     *
     * @param callable $callback
     * @param mixed $initial
     * @return mixed
     */
    public function reduce(callable $callback, $initial = null)
    {
        $result = $initial;

        foreach ($this as $value) {
            $result = $callback($result, $value);
        }

        return $result;
    }

    /**
     * Replace the collection items with the given items.
     *
     * @param mixed $items
     * @return static
     */
    public function replace($items)
    {
        return new static(function () use ($items) {
            $items = $this->getArrayableItems($items);

            foreach ($this as $key => $value) {
                if (array_key_exists($key, $items)) {
                    yield $key => $items[$key];

                    unset($items[$key]);
                } else {
                    yield $key => $value;
                }
            }

            foreach ($items as $key => $value) {
                yield $key => $value;
            }
        });
    }

    /**
     * Recursively replace the collection items with the given items.
     *
     * @param mixed $items
     * @return static
     */
    public function replaceRecursive($items)
    {
        return $this->passthru('replaceRecursive', func_get_args());
    }

    /**
     * Reverse items order.
     *
     * @return static
     */
    public function reverse()
    {
        return $this->passthru('reverse', func_get_args());
    }

    /**
     * Search the collection for a given value and return the corresponding key if successful.
     *
     * @param mixed $value
     * @param bool $strict
     * @return mixed
     */
    public function search($value, $strict = false)
    {
        $predicate = $this->useAsCallable($value)
            ? $value
            : function ($item) use ($value, $strict) {
                return $strict ? $item === $value : $item == $value;
            };

        foreach ($this as $key => $item) {
            if ($predicate($item, $key)) {
                return $key;
            }
        }

        return false;
    }

    /**
     * Shuffle the items in the collection.
     *
     * @param int|null $seed
     * @return static
     */
    public function shuffle($seed = null)
    {
        return $this->passthru('shuffle', func_get_args());
    }

    /**
     * Skip the first {$count} items.
     *
     * @param int $count
     * @return static
     */
    public function skip($count)
    {
        return new static(function () use ($count) {
            $iterator = $this->getIterator();

            while ($iterator->valid() && $count--) {
                $iterator->next();
            }

            while ($iterator->valid()) {
                yield $iterator->key() => $iterator->current();

                $iterator->next();
            }
        });
    }

    /**
     * Skip items in the collection until the given condition is met.
     *
     * @param mixed $value
     * @return static
     */
    public function skipUntil($value)
    {
        $callback = $this->useAsCallable($value) ? $value : $this->equality($value);

        return $this->skipWhile($this->negate($callback));
    }

    /**
     * Skip items in the collection while the given condition is met.
     *
     * @param mixed $value
     * @return static
     */
    public function skipWhile($value)
    {
        $callback = $this->useAsCallable($value) ? $value : $this->equality($value);

        return new static(function () use ($callback) {
            $iterator = $this->getIterator();

            while ($iterator->valid() && $callback($iterator->current(), $iterator->key())) {
                $iterator->next();
            }

            while ($iterator->valid()) {
                yield $iterator->key() => $iterator->current();

                $iterator->next();
            }
        });
    }

    /**
     * Get a slice of items from the enumerable.
     *
     * @param int $offset
     * @param int|null $length
     * @return static
     */
    public function slice($offset, $length = null)
    {
        if ($offset < 0 || $length < 0) {
            return $this->passthru('slice', func_get_args());
        }

        $instance = $this->skip($offset);

        return is_null($length) ? $instance : $instance->take($length);
    }

    /**
     * Split a collection into a certain number of groups.
     *
     * @param int $numberOfGroups
     * @return static
     */
    public function split($numberOfGroups)
    {
        return $this->passthru('split', func_get_args());
    }

    /**
     * Chunk the collection into chunks of the given size.
     *
     * @param int $size
     * @return static
     */
    public function chunk($size)
    {
        if ($size <= 0) {
            return static::empty();
        }

        return new static(function () use ($size) {
            $iterator = $this->getIterator();

            while ($iterator->valid()) {
                $chunk = [];

                while (true) {
                    $chunk[$iterator->key()] = $iterator->current();

                    if (count($chunk) < $size) {
                        $iterator->next();

                        if (!$iterator->valid()) {
                            break;
                        }
                    } else {
                        break;
                    }
                }

                yield new static($chunk);

                $iterator->next();
            }
        });
    }

    /**
     * Sort through each item with a callback.
     *
     * @param callable|null|int $callback
     * @return static
     */
    public function sort($callback = null)
    {
        return $this->passthru('sort', func_get_args());
    }

    /**
     * Sort items in descending order.
     *
     * @param int $options
     * @return static
     */
    public function sortDesc($options = SORT_REGULAR)
    {
        return $this->passthru('sortDesc', func_get_args());
    }

    /**
     * Sort the collection using the given callback.
     *
     * @param callable|string $callback
     * @param int $options
     * @param bool $descending
     * @return static
     */
    public function sortBy($callback, $options = SORT_REGULAR, $descending = false)
    {
        return $this->passthru('sortBy', func_get_args());
    }

    /**
     * Sort the collection in descending order using the given callback.
     *
     * @param callable|string $callback
     * @param int $options
     * @return static
     */
    public function sortByDesc($callback, $options = SORT_REGULAR)
    {
        return $this->passthru('sortByDesc', func_get_args());
    }

    /**
     * Sort the collection keys.
     *
     * @param int $options
     * @param bool $descending
     * @return static
     */
    public function sortKeys($options = SORT_REGULAR, $descending = false)
    {
        return $this->passthru('sortKeys', func_get_args());
    }

    /**
     * Sort the collection keys in descending order.
     *
     * @param int $options
     * @return static
     */
    public function sortKeysDesc($options = SORT_REGULAR)
    {
        return $this->passthru('sortKeysDesc', func_get_args());
    }

    /**
     * Take the first or last {$limit} items.
     *
     * @param int $limit
     * @return static
     */
    public function take($limit)
    {
        if ($limit < 0) {
            return $this->passthru('take', func_get_args());
        }

        return new static(function () use ($limit) {
            $iterator = $this->getIterator();

            while ($limit--) {
                if (!$iterator->valid()) {
                    break;
                }

                yield $iterator->key() => $iterator->current();

                if ($limit) {
                    $iterator->next();
                }
            }
        });
    }

    /**
     * Take items in the collection until the given condition is met.
     *
     * @param mixed $value
     * @return static
     */
    public function takeUntil($value)
    {
        $callback = $this->useAsCallable($value) ? $value : $this->equality($value);

        return new static(function () use ($callback) {
            foreach ($this as $key => $item) {
                if ($callback($item, $key)) {
                    break;
                }

                yield $key => $item;
            }
        });
    }

    /**
     * Take items in the collection while the given condition is met.
     *
     * @param mixed $value
     * @return static
     */
    public function takeWhile($value)
    {
        $callback = $this->useAsCallable($value) ? $value : $this->equality($value);

        return $this->takeUntil(function ($item, $key) use ($callback) {
            return !$callback($item, $key);
        });
    }

    /**
     * Pass each item in the collection to the given callback, lazily.
     *
     * @param callable $callback
     * @return static
     */
    public function tapEach(callable $callback)
    {
        return new static(function () use ($callback) {
            foreach ($this as $key => $value) {
                $callback($value, $key);

                yield $key => $value;
            }
        });
    }

    /**
     * Reset the keys on the underlying array.
     *
     * @return static
     */
    public function values()
    {
        return new static(function () {
            foreach ($this as $item) {
                yield $item;
            }
        });
    }

    /**
     * Zip the collection together with one or more arrays.
     *
     * e.g. new LazyCollection([1, 2, 3])->zip([4, 5, 6]);
     *      => [[1, 4], [2, 5], [3, 6]]
     *
     * @param mixed ...$items
     * @return static
     */
    public function zip($items)
    {
        $iterables = func_get_args();

        return new static(function () use ($iterables) {
            $iterators = Collection::make($iterables)->map(function ($iterable) {
                return $this->makeIterator($iterable);
            })->prepend($this->getIterator());

            while ($iterators->contains->valid()) {

The method valid() does not exist on MuCTS\Collections\HigherOrderCollectionProxy. Since you implemented __call, consider adding a @method annotation.

                yield new static($iterators->map->current());

The method current() does not exist on MuCTS\Collections\HigherOrderCollectionProxy. Since you implemented __call, consider adding a @method annotation.

                $iterators->each->next();

The method next() does not exist on MuCTS\Collections\HigherOrderCollectionProxy. Since you implemented __call, consider adding a @method annotation.

            }
        });
    }

    /**
     * Pad collection to the specified length with a value.
     *
     * @param int $size
     * @param mixed $value
     * @return static
     */
    public function pad($size, $value)
    {
        if ($size < 0) {
            return $this->passthru('pad', func_get_args());
        }

        return new static(function () use ($size, $value) {
            $yielded = 0;

            foreach ($this as $index => $item) {
                yield $index => $item;

                $yielded++;
            }

            while ($yielded++ < $size) {
                yield $value;
            }
        });
    }

    /**
     * Get the values iterator.
     *
     * @return \Traversable
     */
    public function getIterator()
    {
        return $this->makeIterator($this->source);
    }

    /**
     * Count the number of items in the collection.
     *
     * @return int
     */
    public function count()
    {
        if (is_array($this->source)) {
            return count($this->source);
        }

        return iterator_count($this->getIterator());
    }

    /**
     * Make an iterator from the given source.
     *
     * @param mixed $source
     * @return \Traversable
     */
    protected function makeIterator($source)
    {
        if ($source instanceof IteratorAggregate) {
            return $source->getIterator();
        }

        if (is_array($source)) {
            return new ArrayIterator($source);
        }

        return $source();
    }

    /**
     * Explode the "value" and "key" arguments passed to "pluck".
     *
     * @param string|array $value
     * @param string|array|null $key
     * @return array
     */
    protected function explodePluckParameters($value, $key)
    {
        $value = is_string($value) ? explode('.', $value) : $value;

        $key = is_null($key) || is_array($key) ? $key : explode('.', $key);

        return [$value, $key];
    }

    /**
     * Pass this lazy collection through a method on the collection class.
     *
     * @param string $method
     * @param array $params
     * @return static
     */
    protected function passthru($method, array $params)
    {
        return new static(function () use ($method, $params) {
            yield from $this->collect()->$method(...$params);
        });
    }
}