Golang : Check if element exist in map

Key based element search on a map is the most frequent method use to retrieve the associated value. However, there are times when a search will fail and cause panic if the element is not in the map at the first place. The codes below will show you how to check if an element exist in a map or not.

 package main

 import "fmt"

 func main() {

 cities := map[string]string{"city1": "New York", "city2": "Portland"}

 // ok is boolean

 value, ok := cities["city2"] // return value if found or ok=false if not found

 if ok {
 fmt.Println("value: ", value)
 } else {
 fmt.Println("key not found")
 }

 // try something else

 if value, ok = cities["city3"]; ok {
 fmt.Println("value: ", value)
 } else {
 fmt.Println("key not found")
 }

 }

Output :

value: Portland

key not found

Reference :

delete element from map