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Brain meltdown: Practical Foundations for Programming Languages

Last week I found the following free programming book at http://www.cs.cmu.edu/~rwh/plbook/book.pdf  on "Practical Foundations for Programming Languages".

As the title states it focuses on the foundations of programming languages. The idea is that most  programming language features start from the concept of a type
structure that governs its syntax and semantics. Although very interesting to read, it almost cost me a brain meltdown.

Read at your own risk!

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