Master JavaScript from basics to advanced
bind, call, and apply all set this explicitly, but they work differently. Learn exactly when to use each one, how partial application works, and the modern spread alternative to apply.
Constructor functions are the original way to create object factories in JavaScript. Learn how new works, what happens step by step, and how constructor functions relate to classes.
Every JavaScript object links to another object through its prototype. Learn how the prototype chain works, how property lookup walks it, and why it powers JavaScript inheritance.
Class inheritance lets you build new classes on top of existing ones. Learn extends, super, method overriding, and how JavaScript classes chain prototypes under the hood.
try...catch catches runtime errors so your code can recover instead of crashing. Learn the full syntax, finally cleanup, nested handling, conditional catch, and rethrowing patterns.
Build your own error types by extending the Error class. Learn how custom errors make your code more readable, easier to debug, and safer to handle with instanceof checks.
Date.now() is not enough for precise timing. Learn when to use console.time, performance.now, and the Performance Observer API for accurate execution measurement.
Find and fix slow JavaScript with Chrome DevTools. Learn to record performance profiles, read flame charts, use CPU throttling, and identify bottlenecks that make your app feel sluggish.
JavaScript has seven core error types beyond the base Error. Learn when each occurs, what their names and messages look like, and how to handle them correctly with try...catch.
The throw statement stops execution and signals a problem. Learn what to throw, when to throw, how to avoid the ASI pitfall, and the right patterns for rethrowing errors.
The finally block always runs: after success, after an error, even after a return. Learn how to use it for cleanup, why return in finally is dangerous, and when try...finally is enough.
Stop guessing what your code does. Learn every breakpoint type in Chrome DevTools: line breakpoints, conditional breakpoints, logpoints, DOM breakpoints, and event listener breakpoints.
