Introduction
Go (or Golang) is a simple, powerful, and fast programming language created by Google. It’s particularly popular for web servers, cloud software, DevOps, and concurrent applications. If you’re coming from JavaScript, Python, or another language, you’ll find Go’s minimalism refreshing and quickly get productive!
In this post, you’ll learn the essential Go concepts, see how Go compares to other languages, and write your first simple program. Ready? Let’s dive in!
1. Installing Go
2. Your First Go Program
Let’s print “Hello, World!”:
package main
import "fmt"
func main() {
fmt.Println("Hello, World!")
}
Save the code as main.go, then run:
go run main.go
3. Key Concepts in Go
a. Simple Syntax
b. Variables and Types
var age int = 30
name := "Alice"
c. Control Structures
for i := 0; i < 5; i++ {
fmt.Println(i)
}
if age > 18 {
fmt.Println("Adult")
} else {
fmt.Println("Minor")
}
4. Functions
Go functions are simple and can return multiple values.
func add(a int, b int) int {
return a + b
}
result := add(2, 3)
Multiple return values:
func swap(a, b string) (string, string) {
return b, a
}
5. Slices and Maps
Dynamic arrays are called slices:
numbers := []int{1, 2, 3, 4}
numbers = append(numbers, 5)
for i, num := range numbers {
fmt.Println(i, num)
}
Dictionaries are maps:
ages := map[string]int{"Bob": 25, "Alice": 30}
fmt.Println(ages["Alice"])
6. Structs and Methods
Structs let you group related data; methods give them behavior.
type Person struct {
Name string
Age int
}
func (p Person) Greet() {
fmt.Println("Hello, my name is", p.Name)
}
p := Person{Name: "Raj", Age: 28}
p.Greet()
7. Error Handling
Go handles errors explicitly—no exceptions!
import "strconv"
num, err := strconv.Atoi("123")
if err != nil {
fmt.Println("Conversion failed:", err)
} else {
fmt.Println(num)
}
8. Simple Web Server
Want to build a web server? Check this out:
package main
import (
"fmt"
"net/http"
)
func main() {
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
fmt.Fprintln(w, "Hello from Go web server!")
})
http.ListenAndServe(":8080", nil)
}
Run, then visit http://localhost:8080 in your browser!
9. Where to Learn More
