Function definition

A function is a body of code that returns a value. The value returned may depend on arguments provided to the function.

Write a definition of a function called "multiply" that takes two arguments and returns their product.

C

double multiply( double a, double b )
{
  return a * b;
}

MAXScript

fn multiply a b =
(
    a * b
)

Perl

sub multiply( $$ )
{
  $a = shift;
  $b = shift;
  return $a * $b;
}

PHP

function multiply( $a, $b )
{
   return $a * $b;
}

Python

Named function:

def multiply(a, b):
    return a * b

Unnamed function:

multiply = lambda a, b: a * b

A callable - may be useful to allow both simple functions and complex classes to use the same interface:

>>> class Multiply:
...     def __call__(self, a, b):
...             return a * b
... 
>>> multiply = Multiply()
>>> multiply(3, 4)
12

Toka
 [ ( ab-c ) * ] is multiply