How to Define and Call Functions in Go

Define a function using the func keyword followed by the name, parameters, and return types, then call it by writing its name with matching arguments.

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

result := add(2, 3)

The func keyword starts the definition, add is the name, (a, b int) declares two integer parameters, and int after the closing parenthesis specifies the return type. The body { return a + b } contains the logic. To call the function, use add(2, 3) and assign the result to a variable.

A function is a reusable block of code that performs a specific task, like a recipe you can follow multiple times. You define it once with a name and instructions, then you can run it whenever you need by using that name. This keeps your code organized and prevents you from rewriting the same logic over and over.