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<?php declare(strict_types=1); namespace Psl\Collection; use Closure; /** * @template Tk of array-key * @template Tv * * @extends AccessibleCollectionInterface<Tk, Tv> */ interface MapInterface extends AccessibleCollectionInterface { /** * Returns a `VectorInterface` containing the values of the current * `MapInterface`. * * @return VectorInterface<Tv> * * @psalm-mutation-free */ public function values(): VectorInterface; /** * Returns a `VectorInterface` containing the keys of the current `MapInterface`. * * @return VectorInterface<Tk> * * @psalm-mutation-free */ public function keys(): VectorInterface; /** * Returns a `MapInterface` containing the values of the current `MapInterface` * that meet a supplied condition. * * Only values that meet a certain criteria are affected by a call to * `filter()`, while all values are affected by a call to `map()`. * * The keys associated with the current `MapInterface` remain unchanged in the * returned `MapInterface`. * * @param (Closure(Tv): bool) $fn The callback containing the condition to apply to the current * `MapInterface` values. * * @return MapInterface<Tk, Tv> A MapInterface containing the values after a user-specified condition * is applied. */ public function filter(Closure $fn): MapInterface; /** * Returns a `MapInterface` containing the values of the current `MapInterface` * that meet a supplied condition applied to its keys and values. * * Only keys and values that meet a certain criteria are affected by a call * to `filterWithKey()`, while all values are affected by a call to * `mapWithKey()`. * * The keys associated with the current `MapInterface` remain unchanged in the * returned `MapInterface`; the keys will be used in the filtering process only. * * @param (Closure(Tk, Tv): bool) $fn The callback containing the condition to apply to the current * `MapInterface` keys and values. * * @return MapInterface<Tk, Tv> A `MapInterface` containing the values after a user-specified * condition is applied to the keys and values of the current `MapInterface`. */ public function filterWithKey(Closure $fn): MapInterface; /** * Returns a `MapInterface` after an operation has been applied to each value * in the current `MapInterface`. * * Every value in the current Map is affected by a call to `map()`, unlike * `filter()` where only values that meet a certain criteria are affected. * * The keys will remain unchanged from the current `MapInterface` to the * returned `MapInterface`. * * @template Tu * * @param (Closure(Tv): Tu) $fn The callback containing the operation to apply to the current * `MapInterface` values. * * @return MapInterface<Tk, Tu> A `MapInterface` containing key/value pairs after a user-specified * operation is applied. */ public function map(Closure $fn): MapInterface; /** * Returns a `MapInterface` after an operation has been applied to each key and * value in the current `MapInterface`. * * Every key and value in the current `MapInterface` is affected by a call to * `mapWithKey()`, unlike `filterWithKey()` where only values that meet a * certain criteria are affected. * * The keys will remain unchanged from this `MapInterface` to the returned * `MapInterface`. The keys are only used to help in the mapping operation. * * @template Tu * * @param (Closure(Tk, Tv): Tu) $fn The callback containing the operation to apply to the current * `MapInterface` keys and values. * * @return MapInterface<Tk, Tu> A `MapInterface` containing the values after a user-specified * operation on the current `MapInterface`'s keys and values is applied. */ public function mapWithKey(Closure $fn): MapInterface; /** * Returns the first value in the current `MapInterface`. * * @return Tv|null The first value in the current `MapInterface`, or `null` if the * current `MapInterface` is empty. * * @psalm-mutation-free */ public function first(): mixed; /** * Returns the first key in the current `MapInterface`. * * @return Tk|null The first key in the current `MapInterface`, or `null` if the * current `MapInterface` is empty. * * @psalm-mutation-free */ public function firstKey(): int|string|null; /** * Returns the last value in the current `MapInterface`. * * @return Tv|null The last value in the current `MapInterface`, or `null` if the * current `MapInterface` is empty. * * @psalm-mutation-free */ public function last(): mixed; /** * Returns the last key in the current `MapInterface`. * * @return Tk|null The last key in the current `MapInterface`, or `null` if the * current `MapInterface` is empty. * * @psalm-mutation-free */ public function lastKey(): int|string|null; /** * Returns the index of the first element that matches the search value. * * If no element matches the search value, this function returns null. * * @param Tv $search_value The value that will be search for in the current * `MapInterface`. * * @return Tk|null The key (index) where that value is found; null if it is not found * * @psalm-mutation-free */ public function linearSearch(mixed $search_value): int|string|null; /** * Returns a `MapInterface` where each element is a `array{0: Tv, 1: Tu}` that combines the * element of the current `MapInterface` and the provided elements. * * If the number of elements of the `MapInterface` are not equal to the * number of elements in `$elements`, then only the combined elements * up to and including the final element of the one with the least number of * elements is included. * * @template Tu * * @param array<array-key, Tu> $elements The elements to use to combine with the elements of this `MapInterface`. * * @return MapInterface<Tk, array{0: Tv, 1: Tu}> The `MapInterface` that combines the values of the current * `MapInterface` with the provided elements. * * @psalm-mutation-free */ public function zip(array $elements): MapInterface; /** * Returns a `MapInterface` containing the first `n` values of the current * `MapInterface`. * * The returned `MapInterface` will always be a proper subset of the current * `MapInterface`. * * `$n` is 1-based. So the first element is 1, the second 2, etc. * * @param int<0, max> $n The last element that will be included in the returned * `MapInterface`. * * @return MapInterface<Tk, Tv> A `MapInterface` that is a proper subset of the current * `MapInterface` up to `n` elements. * * @psalm-mutation-free */ public function take(int $n): MapInterface; /** * Returns a `MapInterface` containing the values of the current `MapInterface` * up to but not including the first value that produces `false` when passed * to the specified callback. * * The returned `MapInterface` will always be a proper subset of the current * `MapInterface`. * * @param (Closure(Tv): bool) $fn The callback that is used to determine the stopping * condition. * * @return MapInterface<Tk, Tv> A `MapInterface` that is a proper subset of the current * `MapInterface` up until the callback returns `false`. */ public function takeWhile(Closure $fn): MapInterface; /** * Returns a `MapInterface` containing the values after the `n`-th element of * the current `MapInterface`. * * The returned `MapInterface` will always be a proper subset of the current * `MapInterface`. * * `$n` is 1-based. So the first element is 1, the second 2, etc. * * @param int<0, max> $n The last element to be skipped; the $n+1 element will be the * first one in the returned `MapInterface`. * * @return MapInterface<Tk, Tv> - A `MapInterface` that is a proper subset of the current * `MapInterface` containing values after the specified `n`-th element. * * @psalm-mutation-free */ public function drop(int $n): MapInterface; /** * Returns a `MapInterface` containing the values of the current `MapInterface` * starting after and including the first value that produces `true` when * passed to the specified callback. * * The returned `MapInterface` will always be a proper subset of the current * `MapInterface`. * * @param (Closure(Tv): bool) $fn The callback used to determine the starting element for the * returned `MapInterface`. * * @return MapInterface<Tk, Tv> A `MapInterface` that is a proper subset of the current * `MapInterface` starting after the callback returns `true`. */ public function dropWhile(Closure $fn): MapInterface; /** * Returns a subset of the current `MapInterface` starting from a given key up * to, but not including, the element at the provided length from the starting * key. * * `$start` is 0-based. $len is 1-based. So `slice(0, 2)` would return the * elements at key 0 and 1. * * The returned `MapInterface` will always be a proper subset of this * `MapInterface`. * * @param int<0, max> $start The starting key of this Vector to begin the returned * `MapInterface` * @param null|int<0, max> $length The length of the returned `MapInterface` * * @return MapInterface<Tk, Tv> - A `MapInterface` that is a proper subset of the current * `MapInterface` starting at `$start` up to but not including * the element `$start + $length`. * * @psalm-mutation-free */ public function slice(int $start, ?int $length = null): MapInterface; /** * Returns a `VectorInterface` containing the original `MapInterface` split into * chunks of the given size. * * If the original `MapInterface` doesn't divide evenly, the final chunk will be * smaller. * * @param positive-int $size The size of each chunk. * * @return VectorInterface<static<Tk, Tv>> A `VectorInterface` containing the original * `MapInterface` split into chunks of the given size. * * @psalm-mutation-free */ public function chunk(int $size): VectorInterface; }
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