---
# System prepended metadata

title: Build-In 內建類型
tags: [基本類型]

---

# [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
