JavaScript
beginnerTopic 5 of 12 in Backend Development
What it is
JavaScript is the programming language of the web. It runs in every browser and lets you make pages interactive — respond to clicks, validate forms, fetch data from servers, and build full applications.
Why backend developers need it
Static pages can only go so far. JavaScript lets you build dynamic experiences: dropdown menus, search filters, real-time chat, animations, and everything in between.
What to learn
Variables, data types, and operators
Control flow: if/else, loops, switch
Functions: declarations, expressions, arrow functions
Arrays and objects: methods, destructuring, spread
DOM manipulation: selecting, creating, and modifying elements
Events: click, submit, keypress, delegation
Asynchronous JavaScript: callbacks, Promises, async/await
Error handling with try/catch
ES6+ features: modules, template literals, optional chaining
Practice project
Interactive Task Manager
Build a to-do app that lets users add, complete, and delete tasks. Use localStorage to persist data between page reloads. Add a filter to show all, active, or completed tasks.