How to check if a map is empty in Golang

In this tutorial, you will learn how you can check if a map is empty in Golang

I will discuss two ways to check if a map is empty.

1.Using len() function

We can use the len() function to check the length of the map, if the length is 0 then the map is empty otherwise, it is not.

  package main

  import "fmt"

  func main () {
    demoMap := make(map[string]string)

    if len(demoMap) == 0 {
      fmt.Println("map is empty")
    }
  }

2. Using map's keys slice

Another way is to get a slice of a map's keys and check if its length is 0 or not. If the slice of keys is empty then the map is empty

  package main

  import "fmt"

  func main () {
    keys := make([]interface{}, 0)
    demoMap := make(map[string]string)

    //get a slice of keys from the demoMap
    for k, _:= range demoMap {
      keys = append(keys, k)
    }

    if len(keys) == 0 {
      fmt.Println("the map is empty")
    }
  }

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