問題ライブラリ

function sayHi() {
  console.log(name);
  console.log(age);

for (var i = 0; i < 3; i++) {
  setTimeout(() => console.log(i), 1);
}

const shape = {
  radius: 10,
  diameter() {

+true;
!"Lydia";

const bird = {
  size: "small"
};

let c = { greeting: "Hey!" };
let d;
 

let a = 3;
let b = new Number(3);
let c = 3;

class Chameleon {
  static colorChange(newColor) {
    this.newColor = newColor;

let greeting;
greetign = {}; // Typo!
console.log(greetign);

function bark() {
  console.log("Woof!");
}

function Person(firstName, lastName) {
  this.firstName = firstName;
  this.lastName = lastName;

function Person(firstName, lastName) {
  this.firstName = firstName;
  this.lastName = lastName;

function sum(a, b) {
  return a + b;
}

let number = 0;
console.log(number++);
console.log(++number);

function getPersonInfo(one, two, three) {
  console.log(one);
  console.log(two);

function checkAge(data) {
  if (data === { age: 18 }) {
    console.log("You are an adult!");