You are developing a large-scale application using Pug as a template engine, and you need to create reusable components. How would you create a reusable navigation component in Pug that can be included in multiple views?
- Define the navigation component in a separate Pug file, and then include it using the include keyword in each view where you want to use it.
- Create a JavaScript function to generate the navigation HTML and call this function in each view's Pug template.
- Embed the navigation HTML directly in each view's Pug template to ensure it's customized for each page.
- Use an external CSS library to create a navigation menu and import it into your Pug templates.
To create a reusable navigation component in Pug, you should define the navigation component in a separate Pug file and then include it using the include keyword in each view where you want to use it. This approach promotes code reusability and maintainability.
How does the switch statement compare the switch expression with the case expressions in JavaScript?
- It uses strict equality (===) for comparison.
- It uses loose equality (==) for comparison.
- It uses comparison operators (<, >, etc.) for comparison.
- It uses regular expressions for comparison.
In JavaScript, the switch statement uses strict equality (===) to compare the switch expression with the case expressions. This means it checks both the value and the type of the expressions. Using loose equality (==) is not the standard behavior for a switch statement.
In Express.js, which middleware is used to handle errors?
- bodyParser
- errorHandler
- static
- router
In Express.js, the errorHandler middleware is used to handle errors. It's specifically designed to catch errors that occur during request processing and handle them gracefully. The other options are used for different purposes, such as parsing request bodies (bodyParser), serving static files (static), and defining routes (router).
Which of the following strategies can be used to efficiently serve static assets and optimize performance?
- Caching static assets at the server-side.
- Using long, descriptive file names for static assets.
- Serving static assets through a Content Delivery Network (CDN).
- Storing static assets in a database.
Serving static assets through a Content Delivery Network (CDN) is an efficient strategy to optimize performance by distributing assets across geographically distributed servers, reducing latency and improving load times. The other options either don't directly address performance optimization or provide incorrect methods.
How does denormalization in database schema design affect data redundancy and read performance?
- Decreases data redundancy and improves read performance
- Increases data redundancy and improves read performance
- Decreases data redundancy and decreases read performance
- Increases data redundancy and decreases read performance
Denormalization in database schema design increases data redundancy but can improve read performance. By storing redundant data, queries can often be faster since they require fewer joins. However, this comes at the cost of increased storage requirements and potential data update anomalies.
How does the try...catch statement work in asynchronous operations in Node.js?
- It cannot be used with asynchronous operations.
- It catches exceptions asynchronously with the help of callbacks.
- It works synchronously and blocks the event loop.
- It is only applicable to synchronous code.
In Node.js, the try...catch statement can be used with asynchronous operations, but it doesn't catch exceptions directly in asynchronous callbacks. Instead, it catches exceptions that occur during the setup of asynchronous operations or in the main event loop. It doesn't block the event loop.
How can LIMIT and OFFSET be used effectively to optimize SQL queries?
- Use LIMIT to specify the maximum number of rows to retrieve and OFFSET to skip a certain number of rows.
- Use OFFSET to specify the maximum number of rows to retrieve and LIMIT to skip a certain number of rows.
- Use LIMIT and OFFSET together to retrieve all rows in a table.
- Use LIMIT and OFFSET to restrict the number of columns retrieved in a query.
LIMIT is used to restrict the number of rows in the result set, while OFFSET is used to skip a certain number of rows. This is helpful for paginating results and optimizing queries when you don't need to retrieve the entire dataset.
What does JWT stand for in the context of web security?
- JavaScript Web Token
- JSON Web Token
- JavaScript Web Transfer
- JSON Web Transfer
JWT stands for JSON Web Token. It is a compact, self-contained means for securely transmitting information between parties as a JSON object. JWTs are commonly used for authentication and authorization in web security. The other options are not accurate acronyms for JWT.
How does JavaScript handle implicit data type conversion?
- JavaScript automatically converts data types when performing certain operations, which can lead to unexpected results.
- JavaScript throws errors when trying to perform operations on different data types.
- JavaScript prohibits implicit data type conversion to ensure data consistency.
- JavaScript only allows explicit data type conversion using built-in functions.
JavaScript performs implicit data type conversion, also known as type coercion, when operators or functions are used with values of different data types. This can lead to unexpected behavior, so it's important to understand how type coercion works in JavaScript.
Developers can use npm deprecate [@] to mark a package or a specific version as deprecated, displaying a warning message ______ to any developers installing it.
- internally
- externally
- globally
- locally
When using npm deprecate, the correct option is externally. This means that a deprecation warning message will be displayed to any developers installing the package from outside the project.