The keyword def is used in Envision to introduce user-defined functions.

‘def funtype funname (args) with’, function definition

User-defined functions can be introduced with def:

def pure helloWorld() with
  return "Hello World!"

def pure myMax(x : number, y : number) with
  if x > y
    return x
    return x + y

def pure swap(a : text, b : text) with
  return (b, a) // wrapping '(..)' needed, indicates a tuple

show scalar "" with helloWorld() // Hello World!
show scalar "" with myMax(2, 17) // 17

a, b = swap("foo", "bar")
show summary "" with a /* bar */, b /* foo */

The return type is implicit, based on the returned values. Envision does not support expliciting the return type of user-defined function.

See also

User Contributed Notes
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