Is it possible to call a static method from another static method within the same class?
- No, it leads to a syntax error.
- Yes, using the class name.
- No, static methods cannot call each other.
- Yes, using the this keyword.
Yes, it is possible to call a static method from another static method within the same class using the class name. Static methods are associated with the class and can be called using the class name to avoid confusion. Option B is correct.
Which statement correctly initiates a dynamic import in ES6?
- import module from 'module'
- require('module')
- import('module')
- require.ensure(['module'], callback)
The correct syntax for initiating a dynamic import in ES6 is import('module'). This allows you to asynchronously load and work with modules at runtime, enhancing flexibility in the application structure.
Tree shaking can fail to eliminate unused code if modules are dynamically _______ at runtime.
- Imported
- Exported
- Loaded
- Unloaded
The correct option is (c) Loaded. Tree shaking may fail if modules are dynamically loaded at runtime. Dynamically loading modules introduces uncertainty about which modules will be used, making it challenging for the module bundler to perform effective tree shaking.
Static properties are useful for storing data that __________ across all instances of the class.
- varies
- fluctuates
- persists
- changes
Static properties in a class are shared among all instances, ensuring that the data remains consistent across different objects created from the same class. This is particularly useful for information that should be common to all instances.
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.
To rename a named export during import, use the syntax import { originalName as ______ } from 'module-name';.
- newName
- importedName
- aliasName
- renamedName
When importing a named export and giving it a new name, use the as keyword, making option c) aliasName the correct choice. The syntax is import { originalName as aliasName } from 'module-name';.
Can JavaScript handle asynchronous tasks natively, and if so, how is this achieved in relation to the event loop?
- Yes, using callbacks.
- Yes, through asynchronous functions and promises.
- No, JavaScript cannot handle asynchronous tasks natively.
- Yes, through synchronous functions.
JavaScript can handle asynchronous tasks through asynchronous functions and promises. The event loop ensures that asynchronous code is executed at the appropriate time.