Javascript Crash Course
Intro to JS
JavaScript breathes life into web pages. It controls interactivity, data processing, and external API integrations via strictly typed references.
Variables & Constants
let is highly versatile for variables expected to mutate. const locks variables at assignment.
Functions and Arrows
function traditional() { return 1; }
const modern = () => 1;
End of Transcript Summary.
<!DOCTYPE html>
<html>
<head>
<style>
body {
font-family: monospace;
background: #09090b;
color: #fff;
padding: 2rem;
}
button {
background: #cc0000;
color: #fff;
border: none;
padding: 10px 20px;
font-weight: bold;
cursor: pointer;
border-radius: 4px;
}
#output {
margin-top: 20px;
padding: 15px;
border: 1px solid #333;
min-height: 50px;
}
</style>
</head>
<body>
<h2>JS DOM API Playfield</h2>
<button id="btn">Click me</button>
<div id="output">Waiting for event...</div>
<script>
let clicks = 0;
document.getElementById('btn').addEventListener('click', () => {
clicks++;
document.getElementById('output').innerHTML = `You fired the click event <b>${clicks} times</b>! Variables are successfully mutating.`;
});
</script>
</body>
</html>
Interactive Playfield
Explore concepts interactively in this live workspace.
YouTube Transcriptes