This detailed tutorial shows how to implement pure functions in JavaScript that are deterministic and referentially transparent, and create no side effects.

Keep following along as Thau gets down and dirty with the JavaScript Document Object Model, windows and frames, JavaScript syntax with loops, arrays, and functions, and forms.

One is that you can embed any JavaScript expression in JSX by wrapping it in curly braces. Another is that after compilation, JSX expressions become regular JavaScript objects.

Even then, if you declare a const and assign it an object, you can change anything you want within the object itself. In functional programming, this is a big no-no. Mutations are considered a ...