heaps and hash tables in JavaScript

Data Structures 101: implement hash tables in JavaScript
https://www.educative.io/blog/data-strucutres-hash-table-javascript 

removing elements from a hash table:
https://www.tutorialspoint.com/Remove-elements-from-Javascript-Hash-Table

Implementing Heaps in JavaScript by Ankita Masand
https://blog.bitsrc.io/implementing-heaps-in-javascript-c3fbf1cb2e65

JavaScript Arrays:
https://www.w3schools.com/js/js_arrays.asp

edit: 1/13. Including one class in another file in another file in javascript.

https://stackoverflow.com/questions/6998355/including-javascript-class-definition-from-another-file-in-node-js

(try common.js method)