Tips¶
Builtin function¶
Introduction to go programming language¶
Define slice¶
package main
import "fmt"
func main() {
var slice_1 []int
slice_2 := []int {}
slice_3 := make([]int, 0)
var slice_4 = []int {1, 2, 3, 4}
slice_5 := []int {1, 2, 3, 4}
slice_6 := make([]int, 0)
slice_6 = append(slice_6, 1, 2, 3, 4)
slice_7 := slice_4[:]
slice_8 := slice_5[0:4]
slice_9 := make([]int, 4) // [0 0 0 0]
copy(slice_9, slice_4)
fmt.Println(slice_1, slice_2, slice_3, slice_4, slice_5, slice_6, slice_7, slice_8, slice_9)
}
// [] [] [] [1 2 3 4] [1 2 3 4] [1 2 3 4] [1 2 3 4] [1 2 3 4] [1 2 3 4]
Notes:
The first argument of
make,appendandcopyfunctions must be slice.The second argument of
copyfunction also must be slice. (As a special case, it also will copy bytes from a string to a slice of bytes.)The
copyfunction returns the number of elements copied, which will be the minimum of len(src) and len(dst).
package main
import "fmt"
func main() {
slice_1 := []int {1, 2, 3, 4, 5}
slice_2 := []int {11, 22}
slice_3 := []int {111}
slice_4 := []int {}
count := copy(slice_1, slice_2)
fmt.Println(count, slice_1)
count = copy(slice_3, slice_2)
fmt.Println(count, slice_3)
count = copy(slice_4, slice_2)
fmt.Println(count, slice_4)
}
// 2 [11 22 3 4 5]
// 1 [11]
// 0 []
SET the GOPATH and GOROOT environments¶
$ export GOROOT=/usr/lib/go
$ export GOPATH=$HOME/go
$ export PATH=$PATH:$GOROOT/bin:$GOPATH/bin