Go切片的操作

 package main

 import "fmt"

 //切片的操作

 func main() {

     //创建slice
     var s []int  //zero value for slice is nil

     for i := ; i < ; i++ {
         s = append(s,  * i + )
     }
     fmt.Println(s)  //[1 3 5 7 9 11 13 15 17 19]

     s1 := []int{, , , }
     fmt.Println(s1)  //[2 4 6 8]
     fmt.Printf("cap:%d\n", cap(s1)) //cap:4

     s2 := make( []int, )
     fmt.Println(s2)  //[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
     fmt.Printf("cap:%d\n", cap(s2))  //cap:16

     s3 := make( []int, , )  //32设置的是cap值
     fmt.Println(s3)   //[0 0 0 0 0 0 0 0 0 0]
     fmt.Printf("cap:%d\n", cap(s3))  //cap:32

     //复制slice
     copy(s2, s1)
     fmt.Println(s2,len(s2), cap(s2))  //[2 4 6 8 0 0 0 0 0 0 0 0 0 0 0 0] 16 16

     //删除slice中的元素
     s2 = append( s2[:], s2[:]...)
     fmt.Println(s2, len(s2), cap(s2))  //[2 4 6 0 0 0 0 0 0 0 0 0 0 0 0] 15 16

     front := s2[]
     s2 = s2[:]
     fmt.Println(front)  //
     fmt.Println(s2, len(s2), cap(s2))    //[4 6 0 0 0 0 0 0 0 0 0 0 0 0] 14 15

     tail := s2[len(s2) - ]
     s2 = s2[: len(s2) - ]
     fmt.Println(tail)  //
     fmt.Println(s2, len(s2), cap(s2))   //[4 6 0 0 0 0 0 0 0 0 0 0 0]  13 15

 }