猴子补丁

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所谓猴子补丁就是在程序运行的过程中动态的修改一些模块、类、方法，而不是在静态代码中去修改相应的实现

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package main
import (
    "fmt"
    "os"
    "strings"
    "bou.ke/monkey"
)
func main() {
    monkey.Patch(fmt.Println, func(a ...interface{}) (n int, err error) {
        s := make([]interface{}, len(a))
        for i, v := range a {
            s[i] = strings.Replace(fmt.Sprint(v), "hell", "*bleep*", -1)
        }
        return fmt.Fprintln(os.Stdout, s...)
    })
    fmt.Println("what the hell?") // what the *bleep*?
}

golang monkey
http://xiaorui.cc/archives/5128
https://studygolang.com/articles/11296