Functions

Functions in Ride are defined with func keyword. Functions must be defined before they are used.

A function must return a value. The function definition must have an expression to the right of the "=" sign. The return value is the expression result. There is no return statement in Ride.

The return type is inferred automatically by the compiler.

Examples

The say() function without parameters returns the string Hello World!:

func say() = {
  "Hello world!"
}

Here is a function definition with three parameters:

func main(amount: Int, assetId: ByteVector|Unit, names: List[String]) = {
   throw()
}

Function call

Functions can be invoked in prefix and postfix order:

let list = [1, 2, 3]
let a1 = list.size()
let a2 = size(list)

let b1 = getInteger(this, “key”)
let b2 = this.getInteger(“key”)

In these examples a1 is the same as a2 and b1 is the same as b2.

Built-in Functions

The Standard library defines built-in functions that you can use in scripts.

Annotations

In dApp scripts you can define callable functions and verifier function using annotations.