Create and Call Functions in Go #

Functions in Go allow you to organize code into reusable blocks. You can create a function and call it whenever needed.

Creating a Function #

To create (or declare) a function in Go:

1. Use the func keyword.
2. Specify a name for the function, followed by parentheses ().
3. Add code inside curly braces {} that defines what the function should do.

Syntax:

func FunctionName() {
    // code to be executed
}

Calling a Function #

Functions are not executed immediately. They are executed only when called.

Example:

package main
import "fmt"

func myMessage() {
    fmt.Println("I just got executed!")
}

func main() {
    myMessage() // call the function
}

Result:

I just got executed!

A function can also be called multiple times:

package main
import "fmt"

func myMessage() {
    fmt.Println("I just got executed!")
}

func main() {
    myMessage()
    myMessage()
    myMessage()
}

Result:

I just got executed!
I just got executed!
I just got executed!

Naming Rules for Go Functions #

• Must start with a letter
• Can contain letters, numbers, and underscores (A-z, 0-9, _)
• Case-sensitive
• Cannot contain spaces
• For multi-word names, use camelCase or PascalCase for readability

Tip: Give functions descriptive names that indicate what they do.

Functions are fundamental to structuring Go programs, allowing you to write clean, reusable, and modular code.