Golang determines whether key exists in map

The judgment method is value, ok := map[key], if ok is true, it exists.

Recommended video tutorial: go basic tutorial

The example is as follows:

package main
 
import "fmt"
 
func main() {
 
    demo := map[string]bool{
        "a": false,
    }
 
    //错误，a存在，但是返回false
    fmt.Println(demo["a"])
 
    //正确判断方法
    _, ok := demo["a"]
    fmt.Println(ok)
}

Output:

false
true

More related content to learn, Please visit the Programming Tutorial column of the php Chinese website!

The above is the detailed content of Golang determines whether key exists in map. For more information, please follow other related articles on the PHP Chinese website!