How to keep certain properties on an object?

Question

I have this object. If a property's value is null I'm removing that property. But I have some special properties that I want to keep no matter what (even if their values are null). So far my code works great, but I don't like the fact that I have to use the OR || operator over and over. Example:

key === 'alwaysCountWithMe' || key === 'ABC' || key ==='doNotDeleteMe' || key === 'specialProperty'

Here's my code:

var object = {
  "firstname": null,
  "lastname": "White",
  "ABC": null,
  "hobby": null,
  "c": 3,
  "alwaysCountWithMe": null,
  "doNotDeleteMe": null,
  "specialProperty": null,
};

console.log(_.pickBy(object, (value, key) => !!value || key === 'alwaysCountWithMe' || key === 'ABC' || key === 'doNotDeleteMe' || key === 'specialProperty'));

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script>

Is there a cleaner way of doing this without having to use the || over and over?.

Answer 1

Use an array of keys to always keep, and check to see if it includes(key):

var object = {
  "firstname": null,
  "lastname": "White",
  "ABC": null,
  "hobby": null,
  "c": 3,
  "alwaysCountWithMe": null,
  "doNotDeleteMe": null,
  "specialProperty": null,
};
const alwaysKeep = ['alwaysCountWithMe', 'ABC', 'doNotDeleteMe', 'specialProperty'];

console.log(_.pickBy(object, (value, key) => !!value || alwaysKeep.includes(key)));

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script>