js object keys
var myObj = {no:'u',my:'sql'}
var keys = Object.keys(myObj);//returnes the array ['no','my'];js object keys
var myObj = {no:'u',my:'sql'}
var keys = Object.keys(myObj);//returnes the array ['no','my'];javascript object as key
var fighters = new WeakMap();
var bruce = {name: 'Bruce Lee'};
var chuck = {name: 'Chuck Norris'};
fighters.set(bruce, 'Jeet Kune Do');
fighters.set(chuck, 'Karate');
console.log(fighters.get(bruce)); // Jeet Kune Do
console.log(fighters.get(chuck)); // KarateCopyright © 2021 Codeinu
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