How to iterate an ES6 Map, and other Javascript objects

TLDR;

• With an ES6 Map, use for (const [key, value] of myMap), this is equivalent to for (const [key, value] of myMap.entries()).
• With an ES6 Set, use for (const value of mySet), this is equivalent to for (const value of mySet.values()).
• With an array, use for (const value of myArray), this is equivalent to for (const value of myArray.values()).
• With an ordinary object, use for (const [key, value] of Object.entries(obj)).

Other notes:

• Besides above methods, there are also
  -  Map.prototype.keys(), Map.prototype.entries(), Map.prototype.values().
  - Set.prototype.values(), Set.prototype.entries(): set's entries have the value of [value, value].
  - Array.prototype.keys(), Array.prototype.values(), Array.prototype.entries().
  - Object.keys(), Object.values(), Object.entries().
• Object`'s .keys() /  .values() / .entries() return arrays while Map/Set/Array's ones return iterable objects.
• To generate an array from a list of integers. Use [...new Array(5).keys()].map(index => generateValue(index)).
• Convert an ordinary object to ES5 Map: Object.entries(obj).reduce((map, [key, value]) => map.set(key, value), new Map()).
  From ES5 Map to an ordinary object: Object.fromEntries(myMap.entries()).
• To create an array from a list of elements, use literal notation, or Array.of(), instead of new Array(). new Array(3) returns an array of 3 empty elements, while Array.of(3) returns [3].