JavaScript Data Structures and Modern Syntax

Array creation and access, push/pop/shift/unshift/splice, map/filter/reduce/find/findIndex/some/every, sort with comparator functions, spread operator for arrays, chaining array methods

Object literals and property access (dot vs bracket), object methods and this, computed property names, object spread and Object.assign, destructuring (arrays and objects), nested destructuring, rest parameters

Class declarations with constructor, instance methods and properties, inheritance with extends and super, static methods, private fields (#), getters and setters, when to use classes vs plain objects

ES Modules (import/export, named vs default), CommonJS (require/module.exports), organizing code into files, package.json and npm basics, installing and using npm packages, node_modules and .gitignore

Callbacks and callback hell, Promises (resolve/reject/then/catch/finally), Promise.all/Promise.race/Promise.allSettled, async/await syntax, error handling with try/catch in async functions, fetching data with fetch API

try/catch/finally, custom Error classes, throwing errors, JSON.parse/JSON.stringify, reading and writing JSON files with fs/promises, environment variables with process.env and dotenv

Capstone briefing: plan the task manager architecture using classes, modules, async file I/O, JSON persistence, and CLI argument parsing