javascriptequality-operator

Checking if a value is different from any in a given list of values

I'm trying to improve an old React web application for work when i stumble upon this variable:

const condition = (
  param !== const1 && param !== const2 && param !== const3 && ...
)

Is there a best practise to improve this very long and condition?

Solution

  • The idiomatic way of performing such check if you're checking running the !== comparison for all items you should use the Array.every functional predicate.

    It checks that every item matches the condition:

    const condition = [value1, value2, value3].every(value => value !== parameter)