Basic types / Maps / Essential Go
123456789101112131415161718192021222324252627
package main
import "fmt"
func main() {
m := make(map[string]int)
m["number3"] = 3
checkKey := func(k string) {
if n, ok := m[k]; ok {
fmt.Printf("value for key '%s' is %d\n", k, n)
} else {
fmt.Printf("key '%s' doesn't exist in map\n", k)
}
}
// get value for a key that exists
checkKey("number3")
// get value for a key that doesn't exist
checkKey("number4")
// remove a key
delete(m, "number3")
fmt.Printf("deleted key 'number3\n")
checkKey("number3") // and now it doesn't exist
}
Go
INFO