coffeescript check if not in array

Question

Here's something simple to check if user is in moderator. But I want to check if user is not in moderator.

if err && user in moderators
  return

Intuitively it would be like this

if err && user isnt in moderators
  return

But obviously this doesn't work. What's the best way to do it?

score 118 · Accepted Answer · edited Aug 08 '18 at 23:06

118

isnt is the opposite of is, which is the triple equals sign. Just negate the in:

if err and user not in moderators
  return

or, using postfix if:

return if err and user not in moderators

edited Aug 08 '18 at 23:06

Bryan Ash

answered Jun 29 '13 at 00:08

Blender

Ohh yeah things make so much more sense now. – Harry Jun 29 '13 at 00:20
3

You can also use `if` in postfix form to tidy things up even further: `return if err and user not in moderators` – bilalq Sep 04 '14 at 07:47

bobbybee · Answer 2 · 2013-06-29T00:15:51.407

13

In CoffeeScript, NOT can be denoted as ! or not

if err && !(user in moderators)

if err && user not in moderators

would both work.

edited Jun 29 '13 at 00:15

answered Jun 29 '13 at 00:08

bobbybee

3

While this may be true, Coffeescript isn't a superset of JavaScript, so not all JavaScript is valid CoffeeScript. – Blender Jun 29 '13 at 00:12
True. But in this case I think it's fine (should I reword it?) – bobbybee Jun 29 '13 at 00:13
I'd remove the JavaScript part. Also, `not` and `!` are equivalent in CoffeeScript. – Blender Jun 29 '13 at 00:14
Mmk--I don't use coffee script anyway :3 – bobbybee Jun 29 '13 at 00:14

2 Answers2