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> A series of function calls that each do something and each returns a value.

This is not what functional programming is. Functional programming is a completely different paradigm for writing code, and it _is_ declarative by definition. The Wikipedia definition is pretty decent:

    Functional programming is a programming paradigm where programs are constructed by applying and composing functions. It is a declarative programming paradigm in which function definitions are trees of expressions that map values to other values, rather than a sequence of imperative statements which update the running state of the program.

The "Comparison to imperative programming" section[1] offers a decent example of the paradigm, but DOM manipulation in JavaScript is pretty much as imperative as it gets. Having functions is necessary, but not sufficient, for functional programming.

[1]: https://en.wikipedia.org/wiki/Functional_programming#Compari...