JSFiddle - React, Tailwind, and code Playground

by javascriptenlightenment

HTML

<script src="https://getfirebug.com/firebug-lite-debug.js"></script>
<!-- disregard this pane, html is shown in the "result" pane -->




































































<h4><strong>&larr; Code Example from <a href="http://www.javascriptenlightenment.com/" target="_blank">JavaScript Enlightenment Book</a> by <a href="http://www.codylindley.com" target="_blank">Cody Lindley</a></strong></h4>

<p>JavaScript code is executed on page load. Click the "Run" button in the top bar to re-run the JavaScript code. Output is logged to the <a href="http://getfirebug.com/firebuglite" target="_blank">Firebug Lite</a> console below &darr;.</p>

JavaScript

// Produce primitive values
var myNull = null;
var myUndefined = undefined;
var primitiveString1 = "foo";
var primitiveString2 = String('foo'); //did not use new, so we get primitive
var primitiveNumber1 = 10;
var primitiveNumber2 = Number('10'); //did not use new, so we get primitive
var primitiveBoolean1 = true;
var primitiveBoolean2 = Boolean('true'); //did not use new, so we get primitive

/* Access the toString() property method (inherited by objects from object.prototype) to demonstrate that the primitive values are converted to objects when treated like objects. */

//logs "foo" "foo"
console.log(primitiveString1.toString(), primitiveString2.toString()); 

// logs "10" "10"
console.log(primitiveNumber1.toString(), primitiveNumber2.toString());

// logs "true" "true"
console.log(primitiveBoolean1.toString(), primitiveBoolean2.toString()); 

/* This will throw an error and not show up in firebug lite, as null and undefined do not convert to objects and do not have constructors. */
console.log(myNull.toString()); 
console.log(myUndefined.toString());