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1-js/04-object-basics/02-garbage-collection/article.md
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# Garbage collection
Memory management in Javascript is performed automatically and invisibly to us. We create primitives, objects, functions... All that takes memory.
Memory management in JavaScript is performed automatically and invisibly to us. We create primitives, objects, functions... All that takes memory.
What happens when something is not needed any more? How Javascript engine discovers that and cleans up?
What happens when something is not needed any more? How JavaScript engine discovers that and cleans up?
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## Reachability
The main concept of memory management in Javascript is *reachability*.
The main concept of memory management in JavaScript is *reachability*.
Simply put, "reachable" values are those that are accessible or useable somehow. They are guaranteed to be stored in memory.
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For instance, if there's an object in a local variable, and that object has a property referencing another object, that object is considered reachable. And those that it references -- are also reachable. Detailed examples to follow.
There's a background process in the Javascript engine that is called [garbage collector](https://en.wikipedia.org/wiki/Garbage_collection_(computer_science)). It monitors all objects and removes those that became unreachable.
There's a background process in the JavaScript engine that is called [garbage collector](https://en.wikipedia.org/wiki/Garbage_collection_(computer_science)). It monitors all objects and removes those that became unreachable.
## A simple example
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That's the concept how garbage collection works.
Javascript engines apply many optimizations to make it run faster and not affect the execution.
JavaScript engines apply many optimizations to make it run faster and not affect the execution.
Some of the optimizations: