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# Factorio Runtime Docs Version 2.0.77

# table - Runtime Docs

## table :: builtin

Tables are enclosed in curly brackets, like this `{}`.

Throughout the API docs, the terms "array" and "dictionary" are used. These are fundamentally just Lua tables, but have a limitation on which kind of table keys can be used. An array is a table that uses continuous integer keys starting at `1`, while a dictionary can use numeric or string keys in any order or combination.

Concept used in

- LuaBootstrap::register_metatable()
- LuaBootstrap::raise_event()
- LuaHelpers::table_to_json()
- Any
- AnyBasic
- BlueprintInventory