nil type

Author: ljq

EN/null-judge.md

@@ -13,4 +13,20 @@
 ### A struct null value is an empty Struct with "all members are null values" instead of nil,
 
 ### You cannot simply determine whether a struct is nil, because it can never be nil. You can determine whether it is empty by returning an error
-### Common practice in golang standard library: if err! = nil
+### Common practice in golang standard library: if err! = nil
+
+
+### usual type nil
+
+```
+bool      -> false                              
+numbers -> 0                                 
+string    -> ""      
+
+pointers -> nil
+slices -> nil
+maps -> nil
+channels -> nil
+functions -> nil
+interfaces -> nil
+```

README.md

@@ -23,3 +23,4 @@ The notes only sort out some important and difficult-to-understand knowledge poi
 
 #### zh_CN 中文
 [README_CN](https://github.com/iotd/jackliu-golang-notes/tree/master/zh_CN)
+

zh_CN/goroutine/goroutine.md

@@ -40,7 +40,9 @@ func main() {
 
 
 
-### goroutine usage
+### goroutine 用法
+
+
 
 
 

zh_CN/null-judge.md

@@ -14,3 +14,18 @@
 
 ### 不能单纯地判断一个struct是不是nil，因为它永远不可能是nil，可以通过返回一个error来判断是否为空，
 ### golang标准库里的常见做法：if err != nil
+
+### 常见类型的 nil
+
+```
+bool      -> false                              
+numbers -> 0                                 
+string    -> ""      
+
+pointers -> nil
+slices -> nil
+maps -> nil
+channels -> nil
+functions -> nil
+interfaces -> nil
+```