For optimizing complex queries involving multiple JOIN operations, one can use ________ to break them into simpler ones.
- Subqueries
- Indexes
- Caching
- Temporary Tables
For optimizing complex queries involving multiple JOIN operations, one can use "Subqueries" to break them into simpler, more manageable queries. Subqueries allow you to retrieve intermediate results that can be used in the main query.
What is the significance of the order in which middlewares are defined in Express.js?
- The order of middleware does not matter; Express.js automatically arranges them.
- Middlewares are executed in the reverse order of definition.
- Middlewares are executed in the order of definition.
- Middleware order depends on the priority given when defining routes.
In Express.js, middlewares are executed in the order they are defined. The order matters because each middleware can modify the request or response objects and pass them on to the next middleware.
How can you pass data from your Express route handler to your EJS view?
- res.render('view', dataObject);
- req.send('view', dataObject);
- res.render('view', dataObject);
- res.send('view', dataObject);
You can pass data from your Express route handler to your EJS view using the res.render('view', dataObject); method. This method renders the EJS view and includes the data in the view template, making it accessible for rendering dynamic content. The other options are not valid ways to pass data to EJS views.
Which property in the package.json file is used to define scripts that can be run with npm?
- scripts
- commands
- npm-scripts
- tasks
In the package.json file, the scripts property is used to define custom scripts that can be run using npm commands. This property allows you to define various scripts such as "start," "test," or custom scripts for tasks like building, linting, or deploying your application.
In a production environment, it is often recommended to use a CDN (Content Delivery Network) server to serve static files in Express.js applications.
- Proxy
- Local
- Remote
- Secure
Using a CDN (Content Delivery Network) server is recommended in production environments to serve static files. CDNs distribute static assets across multiple servers located around the world, reducing latency and improving load times for users.
How can OAuth 2.0 help in securing RESTful APIs in an Express.js application?
- OAuth 2.0 allows users to authenticate with a username and password.
- OAuth 2.0 provides a framework for implementing authentication and authorization using tokens.
- OAuth 2.0 is not relevant to securing RESTful APIs in Express.js.
- OAuth 2.0 can only be used for securing web applications, not APIs.
OAuth 2.0 is a standard protocol used for securing APIs. It allows you to implement authentication and authorization by issuing tokens to clients. These tokens can be used to access protected resources, making it an effective method for securing RESTful APIs in Express.js applications.
In Node.js, a '______' event is emitted by a readable stream when there is no more data to read.
- close
- end
- finish
- complete
In Node.js, a 'end' event is emitted by a readable stream when there is no more data to read. This event is commonly used to signify the end of data reading operations from a readable stream. The other options (close, finish, complete) are not used in this context.
When using Jest to test React components, the ______ method is commonly used to render components in a test environment.
- render
- mount
- shallow
- component
When testing React components with Jest, the render method from the @testing-library/react library is commonly used to render components into a test environment. This allows you to simulate component rendering and interact with the rendered output for testing.
In JavaScript, the condition in an if statement is converted to a ________ value.
- boolean
- string
- numeric
- object
In JavaScript, the condition in an if statement is converted to a Boolean value. This means that the condition is evaluated and results in either true or false, determining whether the code block inside the if statement is executed or not.
What is the purpose of the break statement in JavaScript loops?
- To exit the current loop and continue with the next iteration
- To end the entire program
- To pause the loop temporarily
- To restart the loop from the beginning
The break statement in JavaScript is used to exit the current loop prematurely and continue with the next iteration of the loop or code block. It doesn't end the entire program or restart the loop from the beginning. It's a useful tool for controlling the flow of loops.