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A tiny PHP collection library enabling array_* like operations on generators and other traversables

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# Collections

[![Build Status](https://travis-ci.com/jakzal/collections.svg?branch=master)](https://travis-ci.com/jakzal/collections)
[![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/jakzal/collections/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/jakzal/collections/?branch=master)

A tiny collection library enabling `array_*` like operations on generators and other traversables.

## Collection interface

```php
interface Collection extends IteratorAggregate
{
    public function merge(Collection $other): Collection;

public function filter(callable $f): Collection;

public function map(callable $f): Collection;

/**
     * @param mixed $initial
     * @param callable $f
     *
     * @return mixed
     */
    public function reduce($initial, callable $f);
}
```

## Collection implementations

### LazyCollection

The lazy collection implementation postpones evaluation of elements until it's necessary.

```php
use Zalas\Collection\LazyCollection;

$c = (new LazyCollection(new \ArrayIterator([1, 2, 3, 4])))
    ->filter(fn (int $e) => 0 === $e % 2)
    ->map(fn (int $e) => $e * 2)
;
```

In legacy PHP versions:

```php
use Zalas\Collection\LazyCollection;

$c = (new LazyCollection(new \ArrayIterator([1, 2, 3, 4)))
    ->filter(function (int $e) {
        return 0 === $e % 2;
    })
    ->map(function (int $e) {
        return $e * 2;
    })
;
```

## Installation

```
composer require zalas/collections
```

## Contributing

Please read the [Contributing guide](CONTRIBUTING.md) to learn about contributing to this project.
Please note that this project is released with a [Contributor Code of Conduct](CODE_OF_CONDUCT.md).
By participating in this project you agree to abide by its terms.

collections

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