In Imperative Programming Languages such as Javascript, Java, and C#, Side Effects are everywhere. This makes debugging very difficult because a variable can be changed anywhere in your program. So when you have a bug because a variable is changed to the wrong value at the wrong time, where do you look? Everywhere? That’s not good.
So You Want to be a Functional Programmer (Part 1)
Charles Scalfani
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Probably the most important point.

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