golang for map's judgment delete operation example

This article illustrates golang's judgment against map and the deletion operation. To share for your reference, specific as follows:

map is an ES6en-ES7en relationship. make is generally used to initialize memory, which helps to reduce the number of memory allocations for subsequent new operations. If 1 is initially defined but not initialized with make, an error will be reported.

package main

import (

"fmt"

)

func main(){

var test =  map[string]string{" The name ":" li 4"," gender ":" male "}

name,ok := test[" The name "] //  if key There are , the name =  li 4  . ok = true, Otherwise, ok = false

if ok{

fmt.Println(name)

}

delete(test," The name ")// Delete as the name is key It doesn't matter if it doesn't exist 

fmt.Println(test)

        var a map[string]string

        a["b"] = "c"// This will report an error, to initialize the memory first 

        a = make(map[string]string)

        a["b"] = "c"// It's not wrong 

}

I hope that this article has been helpful in Go programming.