How does error handling in Promises compare to that in traditional callback patterns?
- Promises provide a centralized .catch() method for error handling, making it more structured.
- Callbacks often rely on try-catch blocks for error handling.
- Error handling is similar in both, with no significant difference.
- Promises don't support error handling.
Promises offer a cleaner and more centralized way of handling errors through the .catch() method. Callbacks, on the other hand, often involve nested try-catch blocks, leading to less readable and more error-prone code. Understanding this difference is crucial for developers transitioning from traditional callback patterns to Promises.
Node.js uses the __________ algorithm for resolving module paths in ES6.
- "CommonJS"
- "ECMAScript"
- "ES6"
- "Import"
Node.js uses the "ECMAScript" algorithm for resolving module paths in ES6, adhering to the ECMAScript Module specifications. This enables the use of import statements for module loading.
Which module system supports dynamic loading of modules: ES6 Modules or CommonJS?
- ES6 Modules
- CommonJS
- Both support dynamic loading
- Neither supports dynamic loading
ES6 Modules support dynamic loading, allowing modules to be loaded on demand. CommonJS does not provide built-in support for dynamic loading.
In a project where tree shaking is vital for performance, how do you decide between using named and default exports?
- Using named exports for small utility functions and default exports for larger, more central functionalities
- Using default exports for small utility functions and named exports for larger, more central functionalities
- Exclusively using named exports to facilitate tree shaking
- Exclusively using default exports to facilitate tree shaking
When tree shaking is crucial for performance, using named exports for smaller utility functions allows for more granular control over what gets included in the bundle. For larger, more central functionalities, default exports can be beneficial. This approach ensures that only necessary code is bundled, improving the efficiency of tree shaking in eliminating unused code.
Describe the implementation of an async function that awaits user input and then processes it.
- Utilize prompt for user input within the async function
- Implement a callback for user input and await its resolution
- Use await with a promise-based input function
- Incorporate async/await with setTimeout for user input
To implement an async function awaiting user input, you can use await in combination with a promise-based input function. This ensures that the function pauses execution until user input is received, maintaining the asynchronous nature of the application.
In a function that generates HTML content, how would template literals enhance code readability and maintainability?
- They allow embedding variables directly in the string, reducing concatenation complexity.
- They provide a more concise syntax for creating HTML templates.
- They enable the use of complex expressions within the template, improving flexibility.
- They simplify the inclusion of special characters in the HTML content.
Template literals allow for more readable and maintainable code by directly embedding variables and expressions, reducing the need for complex string concatenation.
To handle errors in dynamic imports, use a __________ block.
- try-catch
- catch
- error
- finally
When using dynamic imports, it is recommended to use a try-catch block to handle potential errors that may occur during the loading of the dynamically imported module.
What is the primary role of the call stack in JavaScript execution?
- Manages function calls and keeps track of execution contexts
- Stores global variables
- Executes asynchronous code
- Manages browser events
The call stack in JavaScript is responsible for managing function calls. It keeps track of the execution contexts and the order in which functions are called. Understanding the call stack is crucial for comprehending the flow of execution in JavaScript programs.
How does a tagged template literal differ from a regular template literal?
- A tagged template literal is enclosed in backticks and allows expressions to be embedded.
- A regular template literal is enclosed in single quotes and cannot contain expressions.
- A tagged template literal can be used for multiline strings.
- A regular template literal cannot be assigned to a variable.
In a tagged template literal, a function (the tag function) is invoked, receiving the template string and evaluated expressions as arguments. This allows for custom string processing. Regular template literals do not involve a tag function.
What is the main difference between default and named exports in ES6 modules?
- Default exports allow exporting a single value or function per module, while named exports allow exporting multiple values with distinct names.
- Default exports can only be used with functions, whereas named exports can be used with any type of value.
- Default exports are used for private components, while named exports are used for public components.
- Default exports require an additional keyword for import, unlike named exports.
In ES6 modules, default exports are used to export a single value or function, while named exports allow exporting multiple values with distinct names. Default exports are particularly useful when there is only one main entity to be exported from a module.