Void Verbs in J

I'm learning how to use J via online reading and doing some old Java assignments over again using this language, and would like to know how to make a verb that doesn't take any operands, or return any result. The reason being: I would like to allow myself the ability to type in a verb, let's call it go that would run a sequence of code on it's own and save whatever data it would produce in its execution, but would display nothing at all. The overall goal of this wo开发者_StackOverflow社区uld be to eventually be able to reproduce my vending machine class and interface which requires at least the void returnChange() method.

---

Calling a J verb is always done with at least a right argument. Send anything to a monadic verb that ignores the right argument altogether (say 0 or '').

Functions always return something, but using i.0 or '' minimises the data returned.

go =: 3 : 0
    NB. do stuff
    i. 0
)

go ''

---

MPelletier is correct that J verbs always require a right argument to produce a result, and that in executing they necessarily produce a result. The situation is similar for adverbs and conjunctions. Nothing in J is similar to a method that "returns void."

The example provided by MPelletier uses the keyword 'return.' In that context the keyword has no effect. A modified version of that program is offered here:

go =: 3 : 0
  NB. do stuff
  i. 0 0
)

A visible difference between this program and the one posted by MPelletier is that, if executed in the console, it does not produce a blank line before the next prompt. (Any result with zero in position _2 from its shape has this effect.)