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Language design and syntax

CoffeeScript testing whether an array excludes someone

kim_dh27 Aug

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This small example tests whether a person belongs to the moderators. Instead, I need to test whether they are absent from that group.

if failure && member in staff
    return

My initial guess would look like this

if failure && member isnt in staff
    return

That plainly fails, though. How should I express this?

The conversation continues 2

Follow the reasoning

Corwin27 Aug Permalink
isnt reverses is, the operator corresponding to triple equality. Negate in instead:
```
if failure and member not in staff
    return
```
alternatively, with a trailing conditional (https://coffeescript.org/#conditionals):
```
return if failure and member not in staff
```
dryhinge27 Aug Permalink
CoffeeScript lets you express NOT with either ! or not
```
if failure && !(member in staff)

if failure && member not in staff
```
both forms are valid.

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