# The Collection interface

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## Introduction

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().

## Interface synopsis

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

## Table of Contents

- 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