gitmil

const someObj = {};
someObj.someProp = "I am here";
console.log(someObj.hasOwnProperty("someProp")); // true


let withoutPrototype = Object.create(null);
withoutPrototype.someProp = "I am here too"
console.log(Object.hasOwn(withoutPrototype, "someProp" )) //true
console.log(withoutPrototype.hasOwnProperty("someProp")) 
//error withoutPrototype.hasOwnProperty is not a function

gitmil

function doWork() {
 try {
   doSomeWork();
 } catch (err) {
   throw new Error('Some work failed', { cause: err });
 }
 try {
   doMoreWork();
 } catch (err) {
   throw new Error('More work failed', { cause: err });

gitmil

const nums = [0, 1, 2, 3, 4, 5];

const lastElement = nums.at(-1);
const secondLastElement = nums.at(-2);

console.log(lastElement); // prints 5
console.log(secondLastElement); // prints 4

gitmil

class Counter {
  #x = 0;

  #increment() {
    this.#x++;
  }

  #print() {
    return this.#x;
  }

gitmil

class Counter {
  #x = 0; // private class field

  increment() {
    this.#x++;
  }

  print() {
    return this.#x;
  }

gitmil

class Counter {
  x = 0; // public class field

  increment() {
    this.x++;
  }

  print() {
    return this.x;
  }

gitmil

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Hello World', 
  Title: `First Ember Page`,
  actions:{
  	testAction(){
      console.log('Action Click');
		}
  }