Expression Oriented Programming


In a conversation with one of the lead architects of a large publishing company, we were discussing around the coding standards and suddenly the term EOP brought the discussion to a standstill. Ok, just for a few seconds. Once I explained it, it was like “Ah, is that it ?” If you are doing Scala, you can be assured that you are good with it already but let us define it anyway.

With Scala one of the basic premise is that we would be writing purely functional code or rather code in which 80% of the code is pure functions and 20% is reserved for things like I/O. This way we end up following the rule of 80/20 with functional programming.

Scala is mostly EOP, well, OK it does have statements but the basic philosophy is EOP. What is the different between a statement and an expression. A statement does not return…

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