I see. You're using function in its mathematical sense, not in terms of programming.
Perhaps the article would be clearer if you stated up front that you're trying to talk about the mathematical underpinnings of the functional programming paradigm, and not how imperative and functional programming languages differ in practice? From a practical programming standpoint, your characterization of functional programming is both incorrect and confusing.
Perhaps the article would be clearer if you stated up front that you're trying to talk about the mathematical underpinnings of the functional programming paradigm, and not how imperative and functional programming languages differ in practice? From a practical programming standpoint, your characterization of functional programming is both incorrect and confusing.