im4aLL

const signal = (value) => {
    const fn = () => value;
    let subscribers = [];

    const notifySubscribers = () => {
        subscribers.forEach((subscriber) => subscriber(value));
    };

    fn.set = (newValue) => {
        value = newValue;

im4aLL

interface InjectionInstanceInterface {
    [key: string]: any;
}

interface ClassRef<T> extends Function {
    new (...args: any[]): T;
}

class InjectService {
    private instances: InjectionInstanceInterface = {};

im4aLL

/**
 * Parse template string
 *
 * @usage parseTemplate(`my name is {name} {nested.name}`, {name: 'foo', nested: { name: 'bar' }})
 * @param template string
 * @param data object
 * @returns string
 */
export function HelperParseTemplate(template: string, data: any): string {
    return template.replace(/\{([\w\\.]*)\}/g, (str: string, key: string) => {

im4aLL

version: '3.8'

services:

  db:
    image: mysql
    container_name: db
    environment:
      MYSQL_ROOT_PASSWORD: ${DB_PASSWORD}
      MYSQL_DATABASE: ${DB_DATABASE}

im4aLL

type UserUrl = string;

// const getUserUrl = (id: number) => {
//   return `/user/${id}`; // as const
// };

// type UserUrl = ReturnType<typeof getUserUrl>;

const url: UserUrl = '/user/2';

im4aLL

// The Adapter pattern is a structural design pattern that allows objects with incompatible interfaces to work together.

interface NotificationInterface {
  send(subject: string, message: string): boolean;
}

class EmailNotification implements NotificationInterface {
  send(subject: string, message: string): boolean {
    console.log(`Sending email notification: ${subject} ${message}`);
    return true;

im4aLL

// Guard Clause is a technique derived from the fail-fast method 
// whose purpose is to validate a condition and immediately stop the code execution 
// about the result of the validation.
// Using guard clauses is a common and clean technique for simplifying the code block and avoiding unnecessary complexity.

// Example 1
const submitForm = (formData, formMeta) => {
  if (!formMeta.hasError(formData)) {
    formData.submit(); 
  }

im4aLL

// 1
console.log(typeof typeof 1);

// 2
console.log(018 - 015);

// 3
const numbers = [33, 2, 8];
numbers.sort();
console.log(numbers[1]);

im4aLL

version: '3.8'

services:

  mongo:
    image: mongo:latest
    volumes:
      - ./.data/mongodb:/data/db
    environment:
      MONGO_INITDB_ROOT_USERNAME: root

im4aLL

// webpack/modules/babel-loader-rule.js
module.exports = {
    test: /\.js$/,
    exclude: /(node_modules|bower_components)/,
    use: {
        loader: 'babel-loader',
        options: {
            presets: [
                ['@babel/preset-env', { targets: "defaults" }]
            ]