Documentation

Custom Functions

Functions are defined with def. All user-declared functions must return a value and only use keyword arguments (foo='bar').

def foo(s=''):
  return s + ' world!'
return foo(s='Hello') # 'Hello world!'

Tip

All argument definitions must be given a default value.

def foo(s):  # ERROR
  return s + ' world!'
return foo(s='Hello') # 'Hello world!'

Tip

Unlike with Python, positional arguments are not supported with custom functions. All arguments to a function must always be called with name=value. 

def foo(s=''): 
  return s + ' world!'
return foo('Hello')  # ERROR