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golang不定长传参

2019-12-06 18:36 1196 查看

golang不定长传参,三个点... 可以很灵活的传入多个参数,给两个例子,一看就明白了

1、int类型不定长传参

package main

import "fmt"

func main() {
fmt.Println(Sum(1, 4, 6, 7, 8, 9, 100, 200))
}

func Sum(numbers ...int) int {
result := 0
for _, n := range numbers {
result += n
}
return result
}
go run test1.go
335

2、map类型不定长传参

package main

import "fmt"

func main() {
fmt.Println(SumMap(map[string]string{"Italy": "Rome"}, map[string]string{"Japan": "Tokyo"}, map[string]string{"china": "beijing"}))
}

func SumMap(countryCapitalMaps ...map[string]string) map[string]string {
var result map[string]string
result = make(map[string]string)
//注意:这里需要先把多个map的顺序取出,否则会报错
//cannot use k (type int) as type string in map index
//cannot use v (type map[string]string) as type string in assignment
for i, num := range countryCapitalMaps {
fmt.Println(i)
fmt.Println(num)
for k, v := range num {
result[k] = v
}
}
return result
}
go run test2.go  //这里会打印map的顺序号和值
0
map[Italy:Rome]
1
map[Japan:Tokyo]
2
map[china:beijing]
map[Italy:Rome Japan:Tokyo china:beijing]
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