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?

Bryan Ash · Accepted Answer · 2018-08-08 23:06:04Z

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 8, 2018 at 23:06

Bryan Ash

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answered Jun 29, 2013 at 0:08

Blender

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2 Comments

Harry Over a year ago

Ohh yeah things make so much more sense now.

bilalq Over a year ago

You can also use if in postfix form to tidy things up even further: return if err and user not in moderators

bobbybee · Accepted Answer · 2013-06-29 00:15:51Z

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, 2013 at 0:15

answered Jun 29, 2013 at 0:08

bobbybee

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4 Comments

Blender Over a year ago

While this may be true, Coffeescript isn't a superset of JavaScript, so not all JavaScript is valid CoffeeScript.

bobbybee Over a year ago

True. But in this case I think it's fine (should I reword it?)

Blender Over a year ago

I'd remove the JavaScript part. Also, not and ! are equivalent in CoffeeScript.

bobbybee Over a year ago

Mmk--I don't use coffee script anyway :3

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