Golang Maps - Getting Started with Golang

In this Getting Started with Golang, we will learn how to use the Golang Maps map maps keys to values in Golang programming language with step by step guide.

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Source Codes:
package main

import (
"fmt"
"time"
)

// UserSession stores the user's sessions into the Golang's Map
var UserSession = make(map[string]int64)

// StoreUserSession insert new user session to the map
func StoreUserSession(userName string) {
sessionExpiry := time.Now().Add(1 * time.Millisecond).Unix() // this serves as the user's session timeout
UserSession[userName] = sessionExpiry
}

func main() {
fmt.Println("Welcome to the Golang Maps!")

StoreUserSession("AAA")
time.Sleep(1 * time.Second)

StoreUserSession("BBB")
time.Sleep(1 * time.Second)

StoreUserSession("CCC")

// Loop through the map collections
for n, expDT := range UserSession {
fmt.Println("UserName: ", n, " expDT: ", expDT)
}

StoreUserSession("AAA")
time.Sleep(1 * time.Second)
fmt.Println("check duplicate key")

// Loop through the map collections
for n, expDT := range UserSession {
fmt.Println("UserName: ", n, " expDT: ", expDT)
}

// Delete the key from the Golang's Map
fmt.Println("delete the map's key here")
delete(UserSession, "AAA")

// Loop through the map collections
for n, expDT := range UserSession {
fmt.Println("UserName: ", n, " expDT: ", expDT)
}

usrSessionExpiryDate, isFound := GetMapKey("AAA")
fmt.Println("usrSessionExpiryDate: ", usrSessionExpiryDate, " isFound: ", isFound)

usrSessionExpiryDate, isFound = GetMapKey("BBB")
fmt.Println("usrSessionExpiryDate: ", usrSessionExpiryDate, " isFound: ", isFound)
}

// GetMapKey to get the specific key value from a Golang's Map
func GetMapKey(userName string) (int64, bool) {
userSessionExpiry, ok := UserSession[userName]
if !ok {
return userSessionExpiry, ok
}
return userSessionExpiry, ok
}