Advanced

JavaScript · Proficient - advanced patterns and performance

• Closures and lexical scopeMaster how closures capture variables so you can encapsulate state and avoid scoping pitfalls.
• this, prototypes and classesUnderstand how this is resolved dynamically, how the prototype chain works, and what classes actually add to the object model.
• Async in depth: promises, async/await, error handlingLeverage the event loop, parallelize your promises correctly, and make asynchronous error handling reliable.
• ES modules: import/export, structuring a projectStructure your projects with ES modules by leveraging their static analysis and avoiding toxic barrels and circular dependencies.
• Debugging and robustness: try/catch, advanced console, custom errorsBuild an explicit error strategy with dedicated classes, well-placed catch boundaries, and a console used to its full potential.