While this io-ts might look “overkill”, if you’re dealing with data or complex SPA, you might want to make your types “real” and io-ts is the best way to reach this.

One can also use sophisticated statistic software, such as RRR (free, but not that easy to use, overkill).

However, as powerful as the <picture> element is, sometimes it gives us more power than is actually needed to achieve suitable responsiveness. Sometimes all it really takes is a regular <img> element using the srcset and sizes attributes inline.

sed can do so much more, but is totally overkill for this. tr is the right tool for THIS job, but knowledge of sed and regexes will certainly come in handy later!