# [Build-In](https://dart.dev/language/built-in-types) 內建類型 ![top-and-bottom](https://hackmd.io/_uploads/B1c3kF8Eyg.png) ![bifurcate](https://hackmd.io/_uploads/r1uxql_Vyl.png) ### 基本類型: * dynamic: dynamic a; 則a的類型在任何時間都可以任意變換 * Object?: 所有類型的父類型 * Object: 除了Null類型之外, 所有類型的父類型 * [num](https://hackmd.io/@asdf121472/B1fhAevy0/edit)(int, double) * [String](https://hackmd.io/@asdf121472/SJoezQB1A/edit) * [bool](https://hackmd.io/@asdf121472/HyFqDWeg0/edit) * [Runes and grapheme clusters](https://hackmd.io/@asdf121472/SJ_uQnegC/edit) * [Symbol](https://hackmd.io/@asdf121472/SyaVfuIVyl) ### 集合類型: * [Iterable](https://hackmd.io/@asdf121472/HkXHn-cgR) * [List](https://hackmd.io/@asdf121472/BJW6JQ9xR) * [Map](https://hackmd.io/@asdf121472/B1VD2D7WR) * [Set](https://hackmd.io/@asdf121472/SkRQUcfZR) * [Record](https://hackmd.io/@asdf121472/SJs6ILUWA) * [Enum](https://hackmd.io/@asdf121472/HySzeKlG0) ### 特殊類型: * Null(null is instance of Null) * Never * Future and Stream * void