In Express.js, to limit the middleware execution to a particular HTTP method, you should use the ______ method.
- app.use()
- router.use()
- app.method()
- router.method()
To limit the execution of middleware to a specific HTTP method in Express.js, you should use the router.use() method and specify the HTTP method as an argument, such as router.use('GET', middlewareFunction). This ensures that the middleware is only executed for requests with the specified method.
You are tasked with ensuring that a web application works seamlessly and that all components interact as expected. Which testing approach would be most suitable to verify the interactions between different components and services?
- Unit Testing
- Integration Testing
- Functional Testing
- Usability Testing
To verify interactions between different components and services in a web application, Integration Testing is the most suitable approach. Unit Testing focuses on individual units of code, Functional Testing checks if the application meets its specifications, and Usability Testing focuses on user experience. Integration Testing is specifically designed to test the interactions between components.
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.
When using the Buffer.concat(list[, totalLength]) method in Node.js, if the totalLength is not provided, it is calculated from the ______ of the buffers in the list.
- length
- size
- capacity
- content
When totalLength is not provided, the Buffer.concat method calculates it based on the length of the buffers in the list. The length represents the number of bytes in each buffer being concatenated.
Which feature in Pug allows for writing reusable and maintainable code?
- Mixins
- Extends
- Includes
- Blocks
In Pug, the mixins feature allows you to write reusable and maintainable code. Mixins are similar to functions and can be called to generate HTML markup with parameters, making your code more modular and easier to maintain. The other options are used for different purposes in Pug templates.
Which method of the http module is used to create an HTTP server in Node.js?
- http.createServer()
- http.createHTTPServer()
- http.newServer()
- http.initServer()
In Node.js, you create an HTTP server using the http.createServer() method. This method returns an instance of the HTTP server that can listen for incoming HTTP requests. The other options do not exist in the http module.
Node.js uses ________ to achieve Non-Blocking I/O operations, allowing it to handle many connections simultaneously.
- Callbacks
- Promises
- Threads
- Synchronous
Node.js uses Callbacks to achieve Non-Blocking I/O operations. When a task is completed, a callback function is executed, allowing Node.js to handle many connections simultaneously without blocking the execution of other tasks.
For processing HTTP requests, Express.js allows defining middleware functions at the application level and ______ level.
- route
- request
- response
- router
In Express.js, you can define middleware functions at both the application level and router level. These middleware functions can be used to handle different parts of the request-processing pipeline.