YouTipWhat is JavaScript?
JavaScript makes websites interactive. Every browser has a JS engine.
Hello World
console.log("Hello, World!");
document.getElementById("demo").innerHTML = "Changed!";Variables
let name = "Alice"; // can reassign
const age = 25; // cannot reassign
var old = "avoid"; // function-scopedSummary
- Use let and const, avoid var
- console.log() for debugging