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//npx create-react-app my-app --template typescript

import {useState, useEffect} from 'react'

interface ITodo {
  userId: number;
  id: string;
  title: string;
}

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import './App.css';
import {useState} from 'react';

function App() {
  const [count, setCount] = useState({count: 0, theme: 'light'})
  //const [count, setCount] = useState(0)
  //const [theme, setTheme] = useState("dark")

  const incrementCount = () => {
    setCount((prevState) => {

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for (var i = 0; i < 9; i++) {
   console.log(i);
   // more statements
}

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const args = process.argv.slice(2)
console.log(`Hello ${args[0]} your secret ${args[1]} is correct`)

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useState();

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import chaiAsPromised from 'chai-as-promised';
import * as chai from 'chai'
import sinon from 'sinon'
import Book from '../../src/entities/Book';
import BookService from '../../src/Services/BookService';
import { Model } from 'mongoose';

chai.use(chaiAsPromised)
const expect = chai.expect

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function* simple() {
    yield 1
    yield 2
    yield 3
}

let a = simple()
console.log(a.next())
console.log(a.next())
console.log(a.next())

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Node.js process

console.log() is the same of process.stdout.write(msg + '/n')

If you use on index.js:

console.log(process.argv)

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import fetch from 'node-fetch'
import fs from 'fs'

const groupArray = (arr) => {
    let map = new Map()
    for (let i = 0; i < arr.length; i++) {
        const s = JSON.stringify(arr[i].team1);
        if (!map.has(s)) {
            map.set(s, {
                team: arr[i].team1,

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function diagonalDifference(arr) {
    let principalDiagonal = 0
    let secondaryDiagonal = 0
    for (let i = 0; i < arr.length; i++) {
        for (let j = 0; j < arr.length; j++) {
            if (i == j) {
                principalDiagonal += arr[i][j]
            }
        }
    }