map
package main
import (
"fmt"
)
func main() {
var name map[string]string
name = map[string]string{"name1": "adou", "name2": "menghu", "name3": "cat"}
// key
fmt.Println("=========== for map key")
for key := range name {
fmt.Println(key)
}
// value
fmt.Println("=========== for map value")
for _,value := range name {
fmt.Println(value)
}
// key & value
fmt.Println("=========== for map key & value")
for key,value := range name {
fmt.Println(key,":",value)
}
}
$ go run map.go
=========== for map key
name3
name1
name2
=========== for map value
adou
menghu
cat
=========== for map key & value
name1 : adou
name2 : menghu
name3 : cat
array
package main
import "fmt"
func main() {
fmt.Println("=========== index 遍历数组")
arr := [...]int{6,2,4,9,8,3}
for i:= 0;i<len(arr);i++{
fmt.Print(arr[i],"\n")
}
fmt.Println("=========== range 遍历数组")
sum := 0
for _, value := range arr{
//fmt.Println(index, "\t",value)
fmt.Println(value)
sum += value
}
fmt.Println("sum:",sum)
}
$ go run array.go
=========== index 遍历数组
6
2
4
9
8
3
=========== range 遍历数组
6
2
4
9
8
3
sum: 32
slice
package main
import (
"fmt"
)
func main() {
person := [] string {"Tom", "Aaron", "John"}
fmt.Printf("len=%d cap=%d slice=%v\n", len(person), cap(person), person)
fmt.Println("")
//循环 key value
for k, v := range person {
fmt.Printf("person[%d]: %s\n", k, v)
}
fmt.Println("")
for i := range person {
fmt.Printf("person[%d]: %s\n", i, person[i])
}
fmt.Println("")
for i := 0; i < len(person); i++ {
fmt.Printf("person[%d]: %s\n", i, person[i])
}
fmt.Println("")
//使用空白符
for _, name := range person {
fmt.Println("name :", name)
}
}
$ go run slice.go
len=3 cap=3 slice=[Tom Aaron John]
person[0]: Tom
person[1]: Aaron
person[2]: John
person[0]: Tom
person[1]: Aaron
person[2]: John
person[0]: Tom
person[1]: Aaron
person[2]: John
name : Tom
name : Aaron
name : John
本文由 李阿斗创作 旅途愉快～ 我的主页 (￣▽￣)
最后编辑时间为:
2020/10/19 09:22