d4ins

import { Component, useState } from '@angular/core';

@Component({
  selector: 'app-root',
  template: <div class='App'> Counter: {{ counter }} <br /> <app-button (click)="onClick()"></app-button> </div> ,
  styles: []
})
export class AppComponent {

  counter = 0;

d4ins

import React, { useState } from 'react';

function Button(props) {
  return <button onClick={props.onClick}>Click me</button>
}

export function App(prps) {
  const [counter, setCounter] = useState(0);
  const onClick = () => {setCounter(counter + 1 )}

d4ins

function objectsEqual(a, b) {
  return JSON.stringify(a) === JSON.stringify(b);
}

d4ins

const numbers = [1,2,3,4,5,6];

function findOdd(nums) {
  nums % 2
}

d4ins

export class _Core {
  // static property to store instance of the _Core class
  private static _instance?: _Core;

  // private property to store an instance of the _Interfaces.Messaging class
  private readonly messaging: _Interfaces.Messaging;

  // constructor to create an instance of the class and initialize messaging property
  constructor() {
    this.messaging = FirebaseMessaging.default();

d4ins

import React, { useState } from 'react';
import { View, TextInput, Button, StyleSheet } from 'react-native';

const SignInScreen = () => {
  const [email, setEmail] = useState('');
  const [password, setPassword] = useState('');

  const handleSignIn = () => {
    // Sign in logic here
    console.log(email, password);

d4ins

import { _Core, _Interfaces } from './_Core';

describe('_Core', () => {
    const mockMessaging = {
        registerDeviceForRemoteMessages: jest.fn(() => Promise.resolve()),
        getToken: jest.fn(() => Promise.resolve('mockToken')),
        requestPermission: jest.fn(() => Promise.resolve(_Interfaces.AuthorizationStatus.AUTHORIZED)),
    };

    beforeEach(() => {

d4ins

export class _Core {
    private static _instance?: _Core;

    private readonly messaging: _Interfaces.Messaging;

    constructor() {
        this.messaging = FirebaseMessaging.default();
    }

    public static get instance(): _Core {

d4ins

const prototype: Prototype = {
    greeting: "Hello!",
    
    greet: function() {
        console.log(this.greeting);
    },
    
    clone: function() {
        return Object.create(this);
    },

d4ins

interface Prototype {
    greeting: string;
    greet: () => void;
    clone: () => Prototype;
}