How to do an open import in Rhombus

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1

I'm trying to get familiar with Rhombus by programming fizz-buzz. I'm having trouble importing libraries from Racket. The following works, but I'd like to not have to type base. in front of each function call. I tried the open modifier after the import but that didn't work.

#lang rhombus

import:
  lib("racket/base.rkt")

for (i in 1..=100):
  match base.gcd(i, 15)
  | 15: base.displayln("fizzbuzz")
  | 3:  base.displayln("fizz")
  | 5:  base.displayln("buzz")
  | _:  base.displayln(i)
2

Using this seems to work:

import:
  lib("racket/base.rkt") expose:
    gcd
    displayln

I think opening the entire lib("racket/base.rkt") module may have shadowed for but I am not sure.

3

Thanks shhyou, TIL about expose!

4

For this program specifically, you shouldn’t need imports at all.

#lang rhombus/static

for (i in 1..=100):
  match math.gcd(i, 15)
  | 15: println("fizzbuzz")
  | 3:  println("fizz")
  | 5:  println("buzz")
  | _:  println(i)

In general, imports in Rhombus should be prefixed or selectively exposed. Only some libraries are intentionally designed to be opened, like rhombus/rx or rhombus/thread, and they are documented as so, without an import prefix. (The documentation convention can be found here.)

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