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[Variable]
const, let, multiple string line,

[Array]
- instance array, with fix number of items.
- pop, push, unshift, 
- indexOf, lastIndexOf, 
- loop: forEach, for of, entries, keys, values, 
- callback: every, some, filter, find value, findIndex, map, reduce, reduceRight

[WeakSet/Set - dont store duplicate keys]
- add, has, delete, clear

[Map - allow any Object to be used as a key]
get, set, size, delete

[Json]
parse, stringify,

[function]
pre-args value.
Generator function (yield), func short arrow, 
function return multiple values

[class]
constructor, get, set, extends, super


[Module]
export, import from

sample, random, partial,times,uniqueId.bind,map, keys,

delay, then, 

axios.get('/user?ID=12345')
  .then(function (response) {
    console.log(response);
  })
  .catch(function (error) {
    console.log(error);
  });