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• Illuminate Collection
• First Class Collection
• Composite Pattern
• Persist the composite
  • Eloquent
  • Doctrine

+--------+    +--------+    +--------+    +--------+    +--------+
| Source | -> | filter | -> | sortBy | -> | map    | -> | all    |
+--------+    +--------+    +--------+    +--------+    +--------+

• source: scalar/associative array, Collection
• intermediate(returns a Collection): map, filter, where, sortBy...
• terminal(returns a non-Collection): all, implode, reduce, ...

• mutable: each
• immutable: filter

The following image shows the example of shallow copy. Even though, the collection was newly created, but the items in the collection are the same as before.

• Shallow copy(얕은 복사): https://github.com/appkr/collection-example/blob/master/src/Project.php#L23-L26
• Deep copy(깊은 복사): https://github.com/appkr/collection-example/blob/master/src/Doctrine/Todo.php#L105-L118

mkdir collection-example
cd collection-example

git init
echo ".idea" >> .gitignore
echo "vendor" >> .gitignore

echo "{}" > composer.json
composer require "illuminate/support"
composer require "phpunit/phpunit" --dev

mkdir src tests

git add . && git commit -m 'Project created'