In this section, we're going to see how to check whether a key exists in a given map. So we have a map, nameAges, which basically maps names to ages. Check out the following code:
package main
import "fmt"
func main() {
nameAges := map[string]int{
"Tarik": 32,
"Michael": 30,
"Jon": 25,
}
fmt.Println(nameAges["Tarik"])
}As you can see from the following screenshot, we basically fetched the value from the Tarik key. Therefore, it returned only one value, which was 32:
However, there's another way of using this map that returns two things: the first is the value and the second is whether the key exists. For instance, check out the following code:
package main
import "fmt"
func main() {
nameAges := map[string]int{
"Tarik": 32,
"Michael": 30,
"Jon": 25,
}
value, exists := nameAges["Tarik"]
fmt.Println(value)
fmt.Println(exists)
}The output will be as follows:
As you can see, the code returns true because Tarik,...