From b96041b9e122714b7af7c76d8e91149b6df92817 Mon Sep 17 00:00:00 2001
From: asahi <mikiyashiki@outlook.com>
Date: Fri, 10 Jan 2025 13:33:00 +0800
Subject: [PATCH] =?UTF-8?q?=E9=98=85=E8=AF=BBgolang=20const=E7=9B=B8?=
 =?UTF-8?q?=E5=85=B3=E6=96=87=E6=A1=A3?=
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---
 Golang/Golang Document.md | 64 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)

diff --git a/Golang/Golang Document.md b/Golang/Golang Document.md
index 4b7a81c..661db2e 100644
--- a/Golang/Golang Document.md	
+++ b/Golang/Golang Document.md	
@@ -310,3 +310,67 @@ ok      git.kazusa.red/asahi/fuzz-demo  10.360s
 > #### new interesting
 > `new interesting`指会扩充code coverage的用例输入，在fuzz test刚开始时，new interesting数量通常会因发现新的代码路径快速增加，然后，会随着时间的推移逐渐减少
 
+## syntax
+### iota
+`iota`关键字代表连续的整数变量，`0, 1, 2`，每当`const`关键字出现时，其重置为0
+
+其使用示例如下
+```go
+package main
+
+import "fmt"
+
+const (
+	ZERO = iota
+	ONE
+)
+
+const TWO = iota
+
+const (
+	THREE = iota
+	FOUR
+)
+
+func main() {
+	fmt.Println(ZERO) // 0
+	fmt.Println(ONE)  // 1
+	fmt.Println(TWO) // 0
+	fmt.Println(THREE) // 0
+	fmt.Println(FOUR) // 1
+}
+```
+
+另外，const关键字也支持如下语法：
+```go
+package main
+
+import (
+	"fmt"
+	"reflect"
+)
+
+type Shiro uint8
+
+const (
+	ZERO Shiro = iota
+	ONE
+)
+
+const TWO Shiro = iota
+
+const (
+	THREE Shiro = iota
+	FOUR
+)
+
+func main() {
+	fmt.Printf("ZERO %d, %s\n", ZERO, reflect.TypeOf(ZERO).Name())
+	fmt.Printf("ONE %d, %s\n", ONE, reflect.TypeOf(ONE).Name())
+	fmt.Printf("TWO %d, %s\n", TWO, reflect.TypeOf(TWO).Name())
+	fmt.Printf("THREE %d, %s\n", THREE, reflect.TypeOf(THREE).Name())
+	fmt.Printf("FOUR %d, %s\n", FOUR, reflect.TypeOf(FOUR).Name())
+}
+```
+当const在`()`中声明多个常量时，如首个常量的类型被指定，则后续常量类型可省略，后续类型与首个被指定的类型保持一致。
+