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Example code of wmde/traversable-iterator

Informations about the package traversable-iterator

Traversable Iterator

Build Status Scrutinizer Code Quality Code Coverage Latest Stable Version Download count

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:

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

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:

Usage

Running the tests

For a full CI run

composer ci

For tests only

composer test

For style checks only

composer cs

Release notes

1.0.0 (2017-06-17)

All versions of traversable-iterator with dependencies

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Requires php Version >=7.0
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