Functions

Defining and Calling Functions

Functions are fundamental building blocks for writing clean, reusable code. In Ry, you can define a function using the func keyword, followed by the function name and a block of code.

# Define a simple function
func sayHello() {
    out("Hello from a function!")
}

# Call the function
sayHello()

Parameters

You can pass data into functions through parameters. Parameters are declared within the parentheses after the function name, using the same data keyword as variables.

func greet(data name) {
    out("Hello, ${name}!")
}

greet("Bob") # Output: Hello, Bob!
greet("Charlie") # Output: Hello, Charlie!

Return Values

Functions can process data and return a result using the return keyword. When a return statement is executed, the function immediately exits and passes the specified value back to where it was called.

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

data sum = add(5, 3)
out(sum) # Output: 8

Functions in Ry are first-class citizens, which means they can be passed around like any other data. This enables powerful patterns like Closures.