wiosna-dev_common-library/docs/Collection-of-elements.md

Meritoo Common Library

Common and useful classes, methods, exceptions etc.

Collection of elements

Located here: Meritoo\Common\Collection\Collection. It's a set of some elements, e.g. objects. It's iterable and countable. Provides very useful methods. Some of them:

• getFirst() - returns the first element in the collection
• getLast() - returns the last element in the collection
• isEmpty() - returns information if collection is empty
• add($element, $index = null) - adds given element (at the end of collection)
• addMultiple($elements, $useIndexes = false) - adds given elements (at the end of collection)
• prepend($element) - prepends given element (adds given element at the beginning of collection)
• remove($element) - removes given element

Examples of usage below.

An empty collection

use Meritoo\Common\Collection\Collection;

$emptyCollection = new Collection();
var_dump($emptyCollection->isEmpty()); // bool(true)

Simple collection

use Meritoo\Common\Collection\Collection;

$elements = [
    'lorem',
    'ipsum',
    123 => 'dolor',
    345 => 'sit',
];

$simpleCollection = new Collection($elements);
var_dump($simpleCollection->has('dolor')); // bool(true)

More

1. Base test case (with common methods and data providers)
2. Collection of elements
3. Exceptions
4. Static methods
5. Value Objects

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