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监控团队Golang实践 about best-practices HOT 3 OPEN

jacky15 avatar jacky15 commented on August 20, 2024
监控团队Golang实践

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Comments (3)

dellkeji avatar dellkeji commented on August 20, 2024

// go 会返回元素对应数据类型的零值,取值操作总有值返回,不能通过取出来的值来判断 key 是不是在 map 中

// error
x := map[string]string{"demo1": "1", "demo2": "2"}
if v := x["demo3"]; v == "" {
  fmt.Println("demo3 is not exist")
}


// right
x := map[string]string{"demo1": "1", "demo2": "2"}
if _, ok := x["demo3"]; !ok {
    fmt.Println("demo3 is not exist")
}

from best-practices.

shamcleren avatar shamcleren commented on August 20, 2024

// 防止为空的时候 panic

var (
  a  interface{}
  b  int
  ok bool
)

// BAD
b = a.(int)

// GOOD
b, ok = a.(int)

from best-practices.

dellkeji avatar dellkeji commented on August 20, 2024

// 定义常量, 区分某些类型、标识等

// BAD
const (
   Red = 0
   Gray  = 1
)

// GOOD
const (
   Red = iota
   Gray 
)

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