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Functional Programming In Ruby: How To Create Pure Functions is at the core of this paradigm. Pure functions satisfy two main conditions: they will not cause any side effects. When you create pure functions you should try to make them take care of one thing and only one, so your functions will be very easy to test and scale. The concept of Functional Programming is not only for the Ruby Programming Language, you could use this Programming Paradigm in languages such as JavaScript, Python, Scala, Scala etc.
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