Functional programming has been a current in software development since the earliest days, but has taken on new importance in the modern era. This article looks at the concepts behind functional programming and offers a practical understanding with examples in JavaScript and Java.

Functions are fundamental to code organization; they exist in all higher order programming languages. Generally, functional programming means using functions to the best effect for creating clean and maintainable software. More specifically, functional programming is a set of approaches to coding, usually described as a programming paradigm.

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