Functions

Functions are defined with Define and can accept parameters and optionally return an expression.

Function with a return expression

Define a function called square that takes x and returns x multiplied by x.

Print Run square with 5.

The function call produces a value that can be used in another expression.

Multiple parameters

Define a function called add that takes a and b and returns a plus b.

Print Run add with 2 and 3.

Arguments can also be separated with commas where accepted by the parser:

Print Run add with 2, 3.

No parameters

Use nothing:

Define a function called hello that takes nothing
    Print "Hello".
End.

Run hello.

A body-style function without a return expression produces nothing.

Body functions

A function can contain normal statements:

Define a function called greet that takes name
    Print "Hello, " plus name.
End.

Run greet with "Awi".

Calling functions

Run and its lexer alias Call use the same canonical token:

Run greet with "Awi".

A call can be used as an expression when a return value is needed:

Let result be Run square with 5.

Argument errors

The VM checks argument counts. Calling a function with the wrong number of arguments produces a runtime error such as:

Function 'square' expects 1 arguments, got 2

Calling a name that is not a function also produces a runtime error.