Go Functions #

Functions are blocks of code that perform a specific task and can be called whenever needed. They help you:

Reuse code
Organize programs
Make code more readable

In Go, every program has at least one function: the main() function. You can also create your own custom functions.

Why Use Functions? #

Functions allow you to break programs into smaller, manageable pieces. They are especially useful when you need to:

Perform the same operation multiple times
Pass data between different parts of your program
Return results from computations

Quick Examples #

1. Simple Function #

package main
import "fmt"

func greet() {
    fmt.Println("Hello, Go Functions!")
}

func main() {
    greet()
}

Output:

Hello, Go Functions!

2. Function with Parameters #

package main
import "fmt"

func greet(name string) {
    fmt.Printf("Hello, %s!\n", name)
}

func main() {
    greet("Alice")
    greet("Bob")
}

Output:

Hello, Alice!
Hello, Bob!

3. Function with Return Value #

package main
import "fmt"

func add(a int, b int) int {
    return a + b
}

func main() {
    sum := add(5, 7)
    fmt.Println(sum)
}

Output:

4. Recursive Function #

package main
import "fmt"

func factorial(n int) int {
    if n == 0 {
        return 1
    }
    return n * factorial(n-1)
}

func main() {
    fmt.Println(factorial(5))
}

Output:

Functions are fundamental in Go. Mastering them will make your programs modular, efficient, and easier to read.