Defining a Function in Go
To declare a function in Go, follow these steps:
1.Begin with the func keyword.
2.Write the function’s name right before a set of
parentheses ().
3.Enclose the instructions the function should run
within curly braces { }.
Syntax:
func FunctionName() {
// code to be executed
}
Calling a Function in Go
- In Go, functions are not executed as soon as they are defined. Instead, they are stored and run only when explicitly called.
- In the following example, we define a function named myMessage(). The function body is enclosed between { and } and contains a statement that prints a message. To execute the function, we simply call it by writing its name followed by parentheses ().
Example 2:
package main
import ("fmt")
func myMessage() {
fmt.Println("I just got
executed!")
}
func main() {
myMessage()
// Calling the function
}
Output:
I just got executed!
Example 2:
package main
import "fmt"
// Define a function named displayMessage
func displayMessage() {
fmt.Println("I just got
executed!")
}
func main() {
// Call the function three times
displayMessage()
displayMessage()
displayMessage()
}
Output:
I just got executed!
I just got executed!
I just got executed!
Rules for Naming Functions in Go:
- A function name must begin with a letter.
- It can include only letters, digits, and underscores (A–Z, a–z, 0–9, and _).
- Function names are case-sensitive (MyFunc and myFunc are different).
- Spaces are not allowed in function names.
- For function names with multiple words, use naming styles like camelCase or PascalCase, similar to variable naming.
✅ Tip: Choose a name that clearly describes what the function does to
make your code more readable and maintainable.
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