go for range坑和闭包坑的分析
程序员文章站
2023-10-30 15:22:58
看程序:
package main
import (
"fmt"
"time"
)
func main() {
str := []stri...
看程序:
package main import ( "fmt" "time" ) func main() { str := []string{"i","like","golang"} for _, v := range str{ v += "good" } for k, v := range str{ fmt.println(k, v) } time.sleep(1e9) }
结果:
0 i
1 like
2 golang
想一想,为什么。
再看:
package main import ( "fmt" "time" ) func main() { str := []string{"i","like","golang"} for k, v := range str{ fmt.println(&k, &v) } time.sleep(1e9) }
结果:
0xc000012050 0xc00000e1e0
0xc000012050 0xc00000e1e0
0xc000012050 0xc00000e1e0
想一想,为什么。
再看:
package main import ( "fmt" "time" ) func main() { str := []string{"i","like","golang"} for k, v := range str{ str = append(str, "good") fmt.println(k, v) } time.sleep(1e9) }
结果:
0 i
1 like
2 golang
想一想, 为什么。
再看:
package main import ( "fmt" "time" ) func main() { str := []string{"i","like","golang"} for k, v := range str{ go func(i int, s string){ fmt.println(i, s, k, v) }(k, v) } time.sleep(1e9) }
结果:
0 i 2 golang
1 like 2 golang
2 golang 2 golang
想一想,为什么。
最后再看:
package main import ( "fmt" "time" ) func main() { str := []string{"i","like","golang"} for k, v := range str{ go func(i int, s string){ fmt.println(i, s, k, v) }(k, v) time.sleep(1e9) } time.sleep(5e9) }
结果:
0 i 0 i
1 like 1 like
2 golang 2 golang
想一想,为什么。
不多说。
总结
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