From 22a36606d62c4c0e6a9a929dbde2a834e1026e36 Mon Sep 17 00:00:00 2001
From: shfshanyue <xianger94@gmail.com>
Date: Sun, 27 Mar 2022 15:22:10 +0800
Subject: [PATCH] feat: go

---
 go/hello/defer.go             | 23 +++++++++++++++++++++
 go/hello/go.mod               |  3 +++
 go/hello/main.go              | 38 +++++++++++++++++++++++++++++++++++
 go/hello/routine.go           | 13 ++++++++++++
 node-native/encoding/index.js | 10 +++++++++
 node-server/koa/index.js      | 14 +++++++++++++
 6 files changed, 101 insertions(+)
 create mode 100644 go/hello/defer.go
 create mode 100644 go/hello/go.mod
 create mode 100644 go/hello/main.go
 create mode 100644 go/hello/routine.go

diff --git a/go/hello/defer.go b/go/hello/defer.go
new file mode 100644
index 0000000..a55e314
--- /dev/null
+++ b/go/hello/defer.go
@@ -0,0 +1,23 @@
+package main
+
+import "fmt"
+
+func test() int {
+	i := 0
+	defer func() {
+		fmt.Println("defer1")
+	}()
+	defer func() {
+		i += 1
+		fmt.Println("defer2")
+	}()
+	return i
+}
+
+func main() {
+	// Output:
+	// defer2
+	// defer1
+	// return 0
+	fmt.Println("return", test())
+}
diff --git a/go/hello/go.mod b/go/hello/go.mod
new file mode 100644
index 0000000..afdf576
--- /dev/null
+++ b/go/hello/go.mod
@@ -0,0 +1,3 @@
+module hello
+
+go 1.17
diff --git a/go/hello/main.go b/go/hello/main.go
new file mode 100644
index 0000000..b53b4f2
--- /dev/null
+++ b/go/hello/main.go
@@ -0,0 +1,38 @@
+package main
+
+import "fmt"
+
+const (
+	RED = iota
+	GREEN
+	BLUE
+)
+
+func main() {
+	// 赋值
+	var a int = 10
+	fmt.Println(a)
+
+	// 指针
+	var p *int = &a
+	*p = 11
+	fmt.Println(a)
+
+	// Rune -> int32
+	fmt.Println(len("🍉🍇🍑🍓🥝"))
+	fmt.Println(len([]rune("🍉🍇🍑🍓🥝")))
+
+	// map
+	var o = map[string]int{
+		"a": 3,
+		"b": 4,
+	}
+	fmt.Println(o)
+
+	// 判断是否存在某个 key
+	if v, ok := o["a"]; ok {
+		fmt.Println("a exist", v)
+	}
+
+	fmt.Println(RED)
+}
diff --git a/go/hello/routine.go b/go/hello/routine.go
new file mode 100644
index 0000000..d9a9baa
--- /dev/null
+++ b/go/hello/routine.go
@@ -0,0 +1,13 @@
+package main
+
+import "fmt"
+
+func hello() {
+	fmt.Println("hello, shanyue")
+}
+
+func main() {
+	hello()
+	go hello()
+	fmt.Println("main function")
+}
diff --git a/node-native/encoding/index.js b/node-native/encoding/index.js
index 9cdb679..53f207b 100644
--- a/node-native/encoding/index.js
+++ b/node-native/encoding/index.js
@@ -2,6 +2,7 @@ const iconv = require('iconv-lite')
 const { Response } = require('undici')
 
 const str = '山月'
+const emoji = '🍉🍇'
 
 function f1 () {
   new Response(str).arrayBuffer(b => new Uint8Array(b)).then(b => {
@@ -9,10 +10,15 @@ function f1 () {
   })
 }
 
+// 在 iconv 中可以将字符串用以 utf16 编码，而 TextEncoder 不行
 function f2 () {
   const b = iconv.encode(str, 'utf16')
   console.log(b)
   console.log(new Uint8Array(b))
+
+  const c = iconv.encode(emoji, 'utf16')
+  console.log(c)
+  console.log(new Uint8Array(c))
 }
 
 function f3 () {
@@ -21,4 +27,8 @@ function f3 () {
   console.log(b)
 }
 
+function f4 () {
+  iconv.decode('', 'utf16')
+}
+
 f2()
\ No newline at end of file
diff --git a/node-server/koa/index.js b/node-server/koa/index.js
index e3cc288..5a88ffe 100644
--- a/node-server/koa/index.js
+++ b/node-server/koa/index.js
@@ -33,9 +33,23 @@ f = ctx => {
 
 f = (ctx) => {
   // Koa 通过 parseurl 这个库进行 URL 解析
+  // parseurl 将只会解析一次，进行缓存，不会重复解析，可查看其 fresh 方法
+  // https://github.com/pillarjs/parseurl/blob/master/index.js#L153
+  const a = ctx.query.a
+  const b = ctx.query.b
+  const path = ctx.path
   ctx.body = ctx.query
 }
 
+f = (ctx) => {
+  const charset = ctx.request.charset
+
+  const b = ctx.request.charset
+
+  ctx.request.accepts('json')
+  ctx.body = charset
+}
+
 handleRequest = f
 
 app.use(handleRequest)