return a function without params in coffeescript using do

Question

I want to use do to call a function without parameters like so:

do someMethod

from experimenting it seems like I can also write:

total = 42
do total.toString

question, can I do this:

return do next if request.someField == 'ok'

instead of:

return next() if request.someField == 'ok'

I've tried it and it seems to work :) but i want to make sure it will work as intended — Daryna
– Daryna, Commented Feb 15, 2012 at 21:05
Also, I'm curious whether there's some kind of convention about this. Method chaining with or without parens seems to be a religious subject in coffeescript — Daryna
– Daryna, Commented Feb 15, 2012 at 21:07

Linus Thiel · Accepted Answer · 2012-02-15 23:02:56Z

1

The answer is yes.

I see you are asking about convention. The convention, AFAIK, is to use parentheses when there are no parameters: foo(), and to use do when it's convenient to wrap a few variables in a closure:

for item, index in items
  do (item, index) ->
    // Do some stuff

answered Feb 15, 2012 at 23:02

Linus Thiel

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1 Comment

matyr Over a year ago

That's a special-case where you can't replace do with (). Convention doesn't matter there.

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