💡 Here are some of the questions we’re exploring in our latest guide:
Answer: Debouncing and throttling are techniques used to control the rate of execution of certain functions. Debouncing ensures a function is only executed after a pause, while throttling limits the execution rate to a fixed interval.
Explanation: For example, debouncing can be used to delay a search function until the user has stopped typing, while throttling can be used to limit the frequency of API requests to avoid overloading a server.
Answer: A closure leak occurs when a function unintentionally retains references to objects that should have been released. This can lead to memory leaks. To avoid it, ensure that you nullify references to objects when they are no longer needed.
Explanation: For example, in event handlers, remove event listeners to prevent closures from holding references to DOM elements after they are removed from the document.
Explanation: Web Workers are ideal for CPU-intensive tasks, like data processing or rendering, while keeping the main thread responsive for user interactions.
Answer: Promise.all and Promise.race are methods for handling multiple promises. Promise.all waits for all promises to resolve before resolving itself, while Promise.race resolves as soon as the first promise in the array resolves or rejects.
Explanation: Promise.all is useful for executing multiple asynchronous operations in parallel and waiting for all of them to complete. Promise.race can be used when you want the fastest response from multiple sources.
Answer: Both Map and WeakMap are key-value data structures. The key difference is that WeakMap keys are weakly held, allowing their associated values to be garbage collected when there are no other references to the key.
Explanation: Use a Map when you need to associate data with specific objects, and you want to ensure those objects won’t be collected. Use a WeakMap when you want to avoid memory leaks and allow objects to be collected when they are no longer needed.
Answer: async/await is a syntax for handling asynchronous code that makes it appear more like synchronous code. It simplifies error handling and improves code readability.
Explanation: By using the async keyword in front of a function, you can use await within the function to pause execution until a promise is resolved, making the code easier to reason about and maintain.
Answer: The Temporal Dead Zone (TDZ) is the period between entering a scope and the actual declaration of a variable. Variables declared with let and const are hoisted but not initialized in the TDZ.
Explanation: Accessing a variable within its TDZ results in a ReferenceError. The TDZ ensures that variables are accessed only after they’ve been declared.
Nullify references to objects when they are no longer needed.
Remove event listeners when DOM elements are removed.
Avoid circular references that can’t be collected.
Explanation: Memory leaks occur when objects are still referenced and not eligible for garbage collection, so being mindful of object lifecycles and reference management is crucial.