Not poor practice in that Functional Programming is poor practice (it's great practice!). Poor practice in that JS is object oriented and JS engines optimize f

Not poor practice in that Functional Programming is poor practice (it's great practice!). Poor practice in that JS is object oriented and JS engines optimize for OO style, see https://developers.google.com/v8/design https://developers.google.com/v8/design for example. So avoid `this` if you don't care how fast your code runs.