How can default parameters in ES6 simplify recursive function calls?
- Default parameters in ES6 allow for the specification of default values when a function is called without providing certain arguments. In recursive functions, this simplifies the base case handling by providing default values when no explicit argument is passed.
- The use of default parameters in recursive functions helps to eliminate the need for explicit base case checks, as the default values act as implicit base cases. This can lead to more concise and readable recursive function implementations.
- ES6 default parameters enable the definition of recursive functions with fewer parameters, reducing the complexity of function signatures and making recursive calls more intuitive.
- Utilizing default parameters in recursive functions facilitates the creation of more generic and adaptable recursive algorithms, allowing for greater flexibility in handling different input scenarios.
Default parameters in ES6 simplify recursive function calls by providing default values, reducing the need for explicit base case handling. This results in cleaner and more concise code, enhancing the readability of recursive functions.
Question 1: Consider a project with both Node.js and browser targets. How would you use the ES6 module resolution to handle environment-specific code?
- Use relative paths
- Use absolute paths
- Utilize environment variables
- Utilize conditional imports
In a project targeting both Node.js and browsers, you can use conditional imports to handle environment-specific code. This allows you to import different modules based on the execution environment, improving code maintainability and adaptability. By leveraging the ES6 module system's flexibility, you can create modular and environment-aware code.
When multiple asynchronous tasks are independent of each other, use await with __________ to run them concurrently.
- Promise.all
- Promise.race
- Promise.parallel
- Promise.concurrent
To run multiple independent asynchronous tasks concurrently, use await with Promise.all. This ensures all tasks are completed before proceeding.
In the context of Promises and AJAX, how does async/await improve error handling compared to .then() and .catch()?
- It simplifies error handling by using try-catch blocks.
- It requires additional error-checking code.
- It has no impact on error handling.
- It replaces error handling with callbacks.
Async/await improves error handling by allowing the use of try-catch blocks, making code more readable and maintaining a synchronous look and feel. This results in cleaner and more maintainable code, enhancing the developer's ability to handle errors effectively.
How does tree shaking affect the handling of side effects in JavaScript modules?
- Tree shaking removes unused exports during the bundling process, but it may not eliminate side effects.
- Tree shaking automatically handles all side effects, ensuring a clean and efficient codebase.
- Tree shaking has no impact on side effects in JavaScript modules.
- Side effects need to be manually handled regardless of tree shaking.
Tree shaking primarily focuses on eliminating unused exports but doesn't automatically address side effects. Developers must be cautious and handle side effects appropriately in their code.
If you need to access both the index and value in an array using for...of, use __________ to convert the array into an iterable of index-value pairs.
- Object.entries()
- Array.entries()
- indexValuePairs()
- iterable()
If you need to access both the index and value in an array using for...of, use Array.entries() to convert the array into an iterable of index-value pairs. This allows you to destructure the pairs in the for...of loop, providing both index and value in each iteration.
JavaScript’s __________ nature allows it to perform non-blocking operations despite being single-threaded.
- Synchronous
- Asynchronous
- Parallel
- Multithreaded
The correct option is Asynchronous. JavaScript's asynchronous nature is a key feature that enables it to handle multiple tasks concurrently without blocking the main thread. This is achieved through mechanisms like callbacks, Promises, and async/await, making it suitable for building responsive and efficient applications.
A pure function always returns the same output given the same _________.
- Input
- Output
- Variable
- Function
A pure function is a function where the output is solely determined by its input, making it predictable and easier to test. It always returns the same output for the same input.
How does the event loop handle callback functions in JavaScript?
- It executes callbacks immediately when encountered
- It adds callbacks to the call stack for execution
- It delegates callbacks to the message queue for later execution
- It ignores callbacks entirely
The event loop in JavaScript works by constantly checking the call stack and message queue. When the call stack is empty, it picks up tasks from the message queue, including callback functions, and adds them to the call stack for execution. This ensures asynchronous operations are handled in a non-blocking way.
When building a new object that combines properties from several sources, how can the spread operator be used effectively?
- Merge properties using the { ...source1, ...source2 } syntax
- Combine properties using the Object.assign() method
- Concatenate properties using the + operator
- Extend properties using the extends keyword
The spread operator (...) is commonly used to merge properties from multiple sources into a new object. Using { ...source1, ...source2 } allows you to create a new object with properties from both sources effectively.