🟨 JavaScript

What you can learn on this page

• What is JavaScript? — JavaScript is the magic engine that makes web pages alive, dynamic, and interactive. Just like LEGO blocks coming together to build trains and robots that actually move, JavaScript breathes life into HTML pages. Why JavaScript for Test Automation?
• Installation & Setup — Step 1: Install Node.js JavaScript runs outside the browser thanks to the Node.js runtime. When you install Node.js on your computer, npm (Node Package Manager) is automatically installed as well. Node.js is basically Chrome's V8 engine packaged to run locally
• Variables & Operators — In JavaScript, there are three types of toy baskets. The 'var' basket is leaky at the bottom (hoisting/global scope), while 'let' and 'const' are secure, covered castles. A toy placed in 'const' can never have its color changed! Differences between var, let, a
• Data Types & Functions — JavaScript types split into two groups: Primitive types (String, Number, Boolean, Null, Undefined, Symbol, BigInt) are single LEGO bricks holding a value on their own. Reference types (Object, Array, Function) are assembled robots made of many bricks. Function
• String, Numbers & Math — Manipulating strings and numbers is highly common in web test automation. We scrape texts, slice them, parse numbers, and make assertions. Template Literals (backticks) replace Java's `String.format()` — just write `` `Hello ${name}` `` and you're done! Most U
• Array Methods (map, filter) — JavaScript arrays are super smart! When you pass fruits through a robot, `map()` converts each fruit into ice cream. `filter()` picks and keeps only the fresh fruits. `reduce()` squeezes all fruits into one giant cup of juice! Which array method should be used
• Conditions & Loops — Conditionals (if/else, switch) and loops (for, while, for...of, for...in) are the steering wheels of automation flows. Use `if` blocks to handle conditional checks ('If button is visible, click it') and `for...of` loops to scrape all table rows. Syntax is near
• Event Loop & Asynchronous JS — This is a true amusement park! JavaScript is single-threaded, meaning there's only one ice cream server. The 'Call Stack' is the Ice Cream Queue. 'Web APIs' are kids playing with toys in the backyard. The 'Callback Queue' is where kids wait in line to slide ba