prof3ssorSt3v3 · July 13, 2023 17:36
diff --git a/index.html b/index.html
 <!DOCTYPE html>
 <html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Variable Existence</title>
    <script src="index.js" type="module"></script>
  </head>
  <body>
    <header>
      <h1>Checking for Variable Existence</h1>
    </header>
  </body>
 </html>
diff --git a/index.js b/index.js
 import { NAME, frodo } from './mod.js';
 //gimli doesn't exist in mod.js

 const log = console.log;

 let num1 = 42;
 let str1 = 'Steve';
 let obj1 = { a: 123 };
 let arr1 = [1, 2, 3];
 const f1 = function () {
  console.log('f1 function');
 };

 try {
  f2();
 } catch (err) {
  log('error');
  if (err.name === 'ReferenceError') {
    log('f2 does not exist');
    log(err.message);
  }
 }

 // log(typeof NAME);
 // log(typeof frodo);
 // log(typeof gimli);

 // var num2 = 99;
 // var f2 = function () {
 //   console.log('f2 function');
 // };
 // function f3() {
 //   console.log('f3 function');
 // }
 // log(window['num2']);
 // log(window['f2']);
 // log('f3' in window);

 // log(typeof num1);
 // log(typeof str1);
 // log(typeof obj1);
 // log(typeof arr1);
 // log(typeof f1);
 // log(typeof num2 === 'undefined');
diff --git a/mod.js b/mod.js
 export const NAME = 'Frodo';

 export function frodo() {
  console.log('frodo');
 }
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8" />
	<meta name="viewport" content="width=device-width, initial-scale=1.0" />
	<title>Variable Existence</title>
	<script src="index.js" type="module"></script>
	</head>
	<body>
	<header>
	<h1>Checking for Variable Existence</h1>
	</header>
	</body>
	</html>