http://go-courses.tinywan.com/_book/ch7/ch7/ch7/ch7/ch7/ch7/ch7/ch7/channel.html

Signed-off-by: Tinywan <756684177@qq.com>

Author: Tinywan

README.md

@@ -73,8 +73,9 @@ $ go get github.com/Tinywan/golang-tutorial
 ### 34 - 反射 
 ### [35 - 读文件](/docs/golang_tutorial_35.md) 
 
-## 其他文档 
-
-* [如何编写Go代码](/docs/how_to_write_go_code.md) 
+## 文档 
+* [Go 零基础编程入门教程](http://go-courses.tinywan.com/_book/)
+* [Go 语言标准库](http://go-library.tinywan.com/_book/)
+* [如何编写 Go代码](/docs/how_to_write_go_code.md) 
 * [原文](https://golangbot.com/) 
 

demo/channel/demo01.go

@@ -0,0 +1,5 @@
+package main
+
+func main() {
+
+}

demo/point/demo.go

@@ -4,9 +4,16 @@ import (
 "fmt"
 )
 
-func main(){
+func main() {
 b := 255
 var a = &b
-fmt.Printf("Type of a is %T\n",a)
-fmt.Println("address of b is",a)
-}
+fmt.Printf("Type of a is %T\n", a)
+fmt.Println("address of b is", a)
+
+s := map[string]int{"age": 24}
+var t map[string]string // 正确
+t1 := map[string]string // 错误
+fmt.Println(s)
+fmt.Println(t)
+fmt.Println(t1)
+}

demo/point/dmoe002.go

@@ -0,0 +1,47 @@
+package main
+
+import (
+"fmt"
+"reflect"
+)
+
+// import (
+//	"fmt"
+// ) go_basic_courses
+
+func main() {
+// 声明一个集合字典，默认为空
+a := 15
+fmt.Println("address of b is ", a)
+fmt.Println("address of b is ", &a)
+m := map[string]int{}
+fmt.Println("address of b i is ", m)
+fmt.Printf("Type of a is %T\n", m)
+fmt.Printf("m值是 %v \n", m == nil)
+var dir map[string]string
+fmt.Printf("dir字典的值是: | %v \n", dir)
+fmt.Printf("dir字典是否为nil | %v \n", dir == nil)
+// nil map不能赋值,如果直接赋值会报错：“panic: assignment to entry in nil map”，下面语句将会报错
+// dir["name"] = "Tinywan"
+
+fmt.Println("----------------------------")
+// 使用make函数进行初始化创建一个非nil的map
+dir = make(map[string]string)
+// map是引用类型，未初始化的是指向nil，初始化了以后应该就有自己的内存空间了，所以不是nil
+fmt.Printf("dir字典的值是: | %v \n", dir)
+fmt.Printf("dir字典是否为nil | %v \n", dir == nil)
+
+fmt.Println("----------------------------")
+// make之后分配内存了,一旦分配了内存地址就不为空了,可以赋值了
+dir["name"] = "Tinywan"
+fmt.Printf("dir字典的键:值 |%v \n", dir)
+fmt.Printf("dir字典的类型 |%v \n", reflect.TypeOf(dir))
+fmt.Printf("name的值是 |%v \n", dir["name"])
+// value, ok := s["ok"]
+// if ok == nil {
+//	s := make(map[string]int)
+//	s["ok"] = 19
+//	fmt.Println(s["ok"])
+// }
+// fmt.Println(s["ok"])
+}