package main
import "fmt"
 func main() {
     sumFun := func(num1, num2 int) int {
         return num1 + num2
     }
     sum := sumFun(10, 20)
     fmt.Println(sum)
     return
 }

 ./hello
30

package main
import "fmt"
 func main() {
     func(name string) {
         fmt.Println("Hello", name)
     }("TOMOCAT")
     return
 }

 ./hello 
Hello TOMOCAT

package main
import "fmt"
/*
 求和并调用callback函数对结果进行特殊处理
  */
 func sumWorker(data []int, callback func(int)) {
     sum := 0
     for _, num := range data {
         sum += num
     }
     callback(sum)
 }
 func main() {
     // 打印出求和结果
     sumWorker([]int{1, 2, 3, 4}, func(a int) {
         fmt.Println("sum:", a)
     })
     // 判断求和结果是否大于100
     sumWorker([]int{1, 2, 3, 4}, func(a int) {
         if a > 100 {
             fmt.Println("sum > 100")
         } else {
             fmt.Println("sum <= 100")
         }
     })
 }

sum: 10
sum <= 100