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Go Functions

A function is a block of statements that can be used repeatedly in a program

Create a Function

To create (often referred to as declare) a function, do the following:

  • Use the func keyword.
  • Specify a name for the function, followed by parentheses ().
  • Finally, add code that defines what the function should do, inside curly braces {}.

    • Syntax

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

    Call a Function

    Functions are not executed immediately. They are "saved for later use", and will be executed when they are called.

    In the example below, we create a function named "myMessage()". The opening curly brace ( { ) indicates the beginning of the function code, and the closing curly brace ( } ) indicates the end of the function. The function outputs "I just got executed!". To call the function, just write its name followed by two parentheses ():

    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 be called multiple times.

    Example

    package main
    import ("fmt")

    func FunctionName() {
      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

  • A function name must start with a letter
  • A function name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )
  • Function names are case-sensitive
  • A function name cannot contain spaces
  • If the function name consists of multiple words, techniques introduced for multi-word variable naming can be used
    • Tip: Give the function a name that reflects what the function does!

    Go Exercises

    Test Yourself With Exercises

    Exercise:

    Create a function named myFunction and call it inside main().

    package main   
import ("fmt")
    
func  {
  fmt.Println("I just got executed!")
}
    
func main() {
    
}

    Start the Exercise

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