• A programming paradigm that treats computation as the evaluation of mathematical functions and avoids changing-state and mutable data. Functional programming is a declarative programming paradigm in that programming is done with expressions or declarations instead of statements. In functional code, the output value of a function depends only on its arguments, so calling a function with the same value for an argument always produces the same result. This is in contrast to imperative programming where, in addition to a function’s arguments, global program state can affect a function’s resulting value. One of the key motivations for functional programming is making a program easier to understand by eliminating changes in state that do not depend on function inputs, so-called side effects. ← Wikipedia

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