https://dev.to/vcctm/what-is-a-closure-and-why-this-matters-javascript-386p
https://www.w3schools.com/js/js_function_closures.asp
https://www.freecodecamp.org/espanol/news/que-es-un-closure-en-javascript/
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Closures
