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wmde/traversable-iterator
=========================

Turn Traversable objects into Iterators. Fixed version of the native IteratorIterator

1.0.0(8y ago)016.8k1GPL-2.0+PHPPHP >=7.0

Since Jun 17Pushed 7y ago9 watchersCompare

[ Source](https://github.com/wmde/traversable-iterator)[ Packagist](https://packagist.org/packages/wmde/traversable-iterator)[ Docs](https://github.com/wmde/traversable-iterator)[ RSS](/packages/wmde-traversable-iterator/feed)WikiDiscussions master Synced 1mo ago

READMEChangelogDependencies (4)Versions (2)Used By (1)

Traversable Iterator
====================

[](#traversable-iterator)

[![Build Status](https://camo.githubusercontent.com/f9902bbbd11f97b83735435f85a598a9cf9acc582a0e2a0352d984c01d103179/68747470733a2f2f7365637572652e7472617669732d63692e6f72672f776d64652f7472617665727361626c652d6974657261746f722e706e673f6272616e63683d6d6173746572)](http://travis-ci.org/wmde/traversable-iterator)[![Scrutinizer Code Quality](https://camo.githubusercontent.com/d516a327686b029d2381a7a1cacd330534b9b8c1fcb0d2a5e8aeb6330c486ceb/68747470733a2f2f7363727574696e697a65722d63692e636f6d2f672f776d64652f7472617665727361626c652d6974657261746f722f6261646765732f7175616c6974792d73636f72652e706e673f623d6d6173746572)](https://scrutinizer-ci.com/g/wmde/traversable-iterator/?branch=master)[![Code Coverage](https://camo.githubusercontent.com/78fdf614b6b2376dd39df6e3d53d789945d62ebbf95b3d14aacf4b94543e0fdd/68747470733a2f2f7363727574696e697a65722d63692e636f6d2f672f776d64652f7472617665727361626c652d6974657261746f722f6261646765732f636f7665726167652e706e673f623d6d6173746572)](https://scrutinizer-ci.com/g/wmde/traversable-iterator/?branch=master)[![Latest Stable Version](https://camo.githubusercontent.com/89e9fa61236ad282f835d3d0c02c54a3cf0f038140b658f5a347bad4d009fd1d/68747470733a2f2f706f7365722e707567782e6f72672f776d64652f7472617665727361626c652d6974657261746f722f76657273696f6e2e706e67)](https://packagist.org/packages/wmde/traversable-iterator)[![Download count](https://camo.githubusercontent.com/39fddf667d796286a7aca0b588e4c8dab7e5525fea863a083a4297c56d47223f/68747470733a2f2f706f7365722e707567782e6f72672f776d64652f7472617665727361626c652d6974657261746f722f642f746f74616c2e706e67)](https://packagist.org/packages/wmde/traversable-iterator)

`Iterator` that can be constructed from `Traversable` objects.

Can be seen as a fixed version of `IteratorIterator` (which is used internally). `IteratorIterator`behaves in unexpected ways when constructed from an `IteratorAggregate`: it only calls `getIterator`once rather than once per iteration, which is what happens when you traverse the `IteratorAggregate`directly. In other words: looping over an `IteratorIterator` that contains a `IteratorAggregate` yields different behaviour than looping over the `IteratorAggregate` itself. This is unexpected and can be problematic. For instance when the `IteratorAggregate` contains a `Generator` (which happens often), looping over the `IteratorIterator` more than once will cause an error due to the `Generator` not being rewindable.

Example of how `IteratorIterator` fails:

```
$iteratorAggregate = new class() implements \IteratorAggregate {
	public function getIterator() {
		yield 'a';
		yield 'b';
		yield 'c';
	}
}

$iterator = new IteratorIterator( $iteratorAggregate );

foreach ( $iterator as $value ) {}
foreach ( $iterator as $value ) {} // Exception: Cannot rewind a generator that was already run
```

This exception, and more generally difference in behaviour, does not occur when using `TraversableIterator`.

Installation
------------

[](#installation)

To add this package as a local, per-project dependency to your project, simply add a dependency on `wmde/traversable-iterator` to your project's `composer.json` file. Here is a minimal example of a `composer.json` file that just defines a dependency on Traversable Iterator 1.x:

```
{
    "require": {
        "wmde/traversable-iterator": "~1.0"
    }
}
```

Usage
-----

[](#usage)

Running the tests
-----------------

[](#running-the-tests)

For a full CI run

```
composer ci

```

For tests only

```
composer test

```

For style checks only

```
composer cs

```

Release notes
-------------

[](#release-notes)

### 1.0.0 (2017-06-17)

[](#100-2017-06-17)

- Initial release

###  Health Score

31

—

LowBetter than 68% of packages

Maintenance20

Infrequent updates — may be unmaintained

Popularity23

Limited adoption so far

Community12

Small or concentrated contributor base

Maturity58

Maturing project, gaining track record

 Bus Factor1

Top contributor holds 100% of commits — single point of failure

How is this calculated?**Maintenance (25%)** — Last commit recency, latest release date, and issue-to-star ratio. Uses a 2-year decay window.

**Popularity (30%)** — Total and monthly downloads, GitHub stars, and forks. Logarithmic scaling prevents top-heavy scores.

**Community (15%)** — Contributors, dependents, forks, watchers, and maintainers. Measures real ecosystem engagement.

**Maturity (30%)** — Project age, version count, PHP version support, and release stability.

###  Release Activity

Cadence

Unknown

Total

1

Last Release

3257d ago

### Community

Maintainers

![](https://www.gravatar.com/avatar/451bd4039d530fed8f9c3da91bfa519233a397d2182cdfdcad700f6cfea19b7f?d=identicon)[Jeroen De Dauw](/maintainers/Jeroen%20De%20Dauw)

---

Top Contributors

[![JeroenDeDauw](https://avatars.githubusercontent.com/u/146040?v=4)](https://github.com/JeroenDeDauw "JeroenDeDauw (10 commits)")

###  Code Quality

TestsPHPUnit

Code StylePHP\_CodeSniffer

### Embed Badge

![Health badge](/badges/wmde-traversable-iterator/health.svg)

```
[![Health](https://phpackages.com/badges/wmde-traversable-iterator/health.svg)](https://phpackages.com/packages/wmde-traversable-iterator)
```

###  Alternatives

[phamda/phamda

Auto-curried function library

1922.8k](/packages/phamda-phamda)

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