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.
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.
In Express, ______ is used to match any route that has not been matched by earlier routes.
- default
- fallback
- wildcard
- catch-all
In Express.js, a catch-all or wildcard route is used to match any route that has not been matched by earlier routes. This is often used for creating custom error handlers or handling undefined routes.