go 笔记

func rec(i int) {

在go语言里，参数的名称写在类型的前面

 

 

 22         for index,value :=range arg {

 23                 println(index,value);

 24         }
 
[] int ＝>slice
[5] int => array    new returns a pointer.  make returns initialized (non zero) values.    make creates slices, maps, and channels only, and it returns an initialized (not zero)
value of type T, not *T.  无名函数的定义：  defer func(x int) {
/* ... */
}(5)                        ← Give the input variable x the value 5defer func() {/* ... */
}()                         ← ()is needed here

  func main() {
     a := func() {          ← Define a nameless function and assign to a
     println("Hello")
     }                      ← No () here   
     a()                    ← Call the function
} 

常量：

  3 const(
  4         _ =100*iota
  5         ADD             ← Implicitly ADD = 100*iota
  6         SUB
  7         MUL
  8         DIV
  9         MAXPOS = 11
 10         )

ADD＝100，SUB＝200，MUL＝300，DIV＝400