golang map determines whether key exists

How does the map in Go language determine whether the key exists? Provides a method for judging whether an item is in the array. If this judgment is frequently used in the program, the array can be converted into a map with the members in the array as keys and then judged using the above method, which will improve the efficiency of judgment. The judgment method is value, ok := map[key], if ok is true, there is

if _, ok := map[key]; ok {
//存在
}

Output

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)
}

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