What is domain scraping?

In JavaScript, should I use try catch or if statements?

Which is more efficient? and why?

How does horizon compare with solutions like Falcor or Relay for building realtime applications?

I'm going to work on a real-time​ project for a client and currently evaluating options on what to build it with. I've filtered down to these three things. Any input would be helpful.

Is anyone using Nuclide to write ReactJS apps?

What are some good PaaS offerings for hosting PHP+MySQL web apps?

Is using Pjax to build SPAs a bad practice?

A friend told me that he was using Pjax to build SPAs. Isn't it bad as pjax apparently doesn't take advantage of client side rendering? All it does it use pushState() and set innerHTML of divs. Please correct me if I am wrong.

Best book for understanding CSS?

To be very honest, I am very poor in designing and drawing since childhood. Being a hard-core developer, I am not fan of CSS. What are the best books in CSS?

What are some nice tricks to lower the response time of a website?

A great response time is very important if you want to provide a good user experience. Just wondering what are the things you guys have tried out in order to achieve success here? Hoping to see some nice tips! Thanks guys.

For a content driven website or a social network type of web app which one is a better choice - MongoDB or MySQL?

Many people say that MongoDB can be a bad idea in the long run and MySQL is the right way to structure your data in user content driven websites. What do you guys think?

What's Sharding in DBMS anyway?

I am new to Databases and related stuff. I am simply not able to wrap my head around the concept of sharding. Can someone please help me understand sharding? P.S. I am using MongoDB.