I totally agree: small specialised modules are great. Underscore is only worthwhile if you need some significant fraction of it (but it makes for an easy exampl

I totally agree: small specialised modules are great. Underscore is only worthwhile if you need some significant fraction of it (but it makes for an easy example). I think 4. it actually really important — regardless of whether you're using big or small libraries — it doesn't take long before the maintenance cost of any code you write starts to become a drag; any maintenance you can avoid by using open source libraries should be considered an investment in future productivity. Of course, that doesn't apply if the third party code is crap or not suited to your immediate use case.