Is there a better way to do optional function parameters in JavaScript? [duplicate]

Answer 1

1. arg || 'default' is a great way and works for 90% of cases

2. It fails when you need to pass values that might be 'falsy'

   • false
   • 0
   • NaN
   • ""

   For these cases you will need to be a bit more verbose and check for undefined

3. Also be careful when you have optional arguments first, you have to be aware of the types of all of your arguments