In this tutorial, We are going to learn about how to check if a map is empty in go. map is a collection of unordered pairs of key-value.
len() built-in function is used to get the length the of map. If len() function returns 0 then map is empty.
Syntax:
length = len(map_name) or if len(map_name) == 0 { fmt.Println("It's an empty map") }
Go code to check empty map:
package main
import (
"fmt"
)
func main() {
m := map[string]int {}
if len(m) == 0 {
fmt.Println("It's an empty map")
} else {
fmt.Println("Map is not empty")
}
}When we do it by len of map like len(map), in this case, It returns number of entries key-value pair present in map.
Example:
map = {"sun": a, "mon": 2, "tue": 3}
length of map = len(map)
length of map = 3
Go code to check length of map
package main
import (
"fmt"
)
func main() {
m := map[string]int {
"sun": 0,
"mon": 1,
"tue": 3,
}
fmt.Println("Length of map: ", len(m))
}
Output:
Length of map: 3
To learn more about golang, You can refer given below link:
https://techieindoor.com/go-lang-tutorial/
References: