How do I check if boolean object key contains value?
Category is a string, so I just check if it contains any value and then I am able to update it
```js
gig.category = req.body.category ? req.body.category : gig.category;
```

but approvedForMenu is a boolean. So my ternary operator is checking for true or false instead.
I can change the value to true but I cant change it back to false. 
How do I write the code so I can be able to change it back to false?
```js
gig.approvedForMenu = req.body.approvedForMenu ? req.body.approvedForMenu : gig.approvedForMenu;
```

You can use `??`, which checks for null/undefined instead of truthiness/falsiness

@Script  <https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Nullish_coalescing>