Maps In GoLang

✌ Go provides another important data type map that maps unique keys to values. A key is an object that you use to retrieve a value at a later date. Given a key and a value, you can store the value in a Map object. After the value is stored, you can retrieve it by using its key.

A Go map type looks like this:

map[KeyType]ValueType

Declaration and initialization:

1) m := make(map[string]int)

2) m := map[string]int{}

3) var m map[string]int{}

Map to get key of value :

1). i := m["route"]

2). i, ok := m["route"]

3). for key, value := range m {

           fmt.Println("Key:", key, "Value:", value)

     }

The built-in len function returns on the number of items in a map:

n := len(m)

The built-in delete function removes an entry from the map:

delete(m, "rouzte")

GO Program :

package main

import ( "fmt" )

func main() {

               var m = make(map[string]int)

               m["m"] = 24

               m["a"] = 31

               m["ma"] = 21

               for key, value := range m {  

                               fmt.Println("Key:", key, "Value:", value)

               }

}