No-Library (pure JS), HTML, CSS, JavaScript
jQuery (edge), HTML, CSS, JavaScript
Eloquent JS p.117-120 Mail delivery robot, we have 14 roads and 11 parcels
Eloquent JS p.115-116 Custom Set (using ES5 constructor)
https://stackoverflow.com/questions/36527642/difference-between-codepointat-and-charcodeat
eloquent JS p.79