javascript-mastery

JavaScript closures occur when a function retains access to its lexical scope even after the outer function executes. This skill explains scope chains, execution contexts, and variable access mechanics with practical code examples.

Promises use chaining via `.then()` to handle asynchronous operations, while async/await provides synchronous-looking syntax over promises. This skill breaks down asynchronous execution, microtasks, and event loop behavior for both approaches.

You can explain primitive types as non-object data structures and prototypal inheritance as objects delegating methods to their prototype chain. This skill provides clear teaching explanations and best practices for reviewing these fundamental concepts.

Yes, it covers ES6+ features and modern JavaScript syntax like arrow functions, destructuring, and classes. The skill provides real-world use cases and explanations to help you apply modern syntax in everyday coding tasks.

JavaScript behaves unpredictably due to automatic type coercion and the single-threaded event loop managing execution contexts. This skill helps you debug tricky patterns and understand language quirks by explaining underlying mechanisms clearly.