feat: go

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())
+}

go/hello/go.mod

@@ -0,0 +1,3 @@
+module hello
+
+go 1.17

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)
+}

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")
+}

node-native/encoding/index.js

@@ -2,17 +2,23 @@ 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 => {
     console.log(b)
   })
 }
 
+// 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()

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)