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Following the post What Books Should Everyone Read, I noticed that there are recent books whose drafts are available online.

For instance, the Approximation Algorithms entry of the above post cites a 2011 book (yet to be published) titled The design of approximation algorithms.

I think knowing recent works is really useful for whoever wants to get a taste of TCS trends. When drafts are available, one can check the books before actually buying them.

So,

What are the recent TCS books whose drafts are available online?

Here, by "recent", I mean something that's no older than ~5 years.