# The Collection interface

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## はじめに

Collection is the base interface which covers functionality common to all the data structures in this library. It guarantees that all structures are traversable, countable, and can be converted to json using json_encode().

## インターフェイス概要

Ds\Collection implements Traversable , Countable , JsonSerializable {
/* メソッド */
abstract public clear ( void ) : void
abstract public copy ( void ) : Ds\Collection
abstract public isEmpty ( void ) : bool
abstract public toArray ( void ) : array
}

## 目次

- Ds\Collection::clear — Removes all values
- Ds\Collection::copy — Returns a shallow copy of the collection
- Ds\Collection::isEmpty — Returns whether the collection is empty
- Ds\Collection::toArray — Converts the collection to an array