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# Unicode, String internals # Unicode, String internals
```warn header="Advanced knowledge" ```warn header="Advanced knowledge"
The section goes deeper into string internals. This knowledge will be useful for you if you plan to deal with emoji, rare mathematical or logographic characters, or other rare symbols. The section goes deeper into string internals. This knowledge will be useful for you if you plan to deal with emoji, rare mathematical or hieroglyphic characters, or other rare symbols.
``` ```
As we already know, JavaScript strings are based on [Unicode](https://en.wikipedia.org/wiki/Unicode): each character is represented by a byte sequence of 1-4 bytes. As we already know, JavaScript strings are based on [Unicode](https://en.wikipedia.org/wiki/Unicode): each character is represented by a byte sequence of 1-4 bytes.