es6 & map & set
Map & WeakMap
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap
Set & WeakSet
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakSet
blogs
https://es6.ruanyifeng.com/#docs/set-map
https://medium.com/front-end-weekly/es6-map-vs-object-what-and-when-b80621932373
refs
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