When implementing a transform stream, which method should be implemented to handle the transformation of chunks?
- _transform
- _read
- _write
- _pipe
When implementing a transform stream in Node.js, you should implement the _transform method. This method receives input data in chunks and allows you to process and transform the data before passing it downstream. The other options are not specific to transform streams.
What is a Closure in JavaScript?
- A function with no parameters.
- A function that can be called only once.
- A function that has access to its own scope, as well as the outer (enclosing) function's scope.
- A function that returns a random value.
In JavaScript, a closure is a function that has access to its own scope, as well as the outer (enclosing) function's scope. This allows it to capture and remember values from the outer function even after the outer function has finished executing.
How can you catch synchronous errors occurring in a route handler in Express?
- Using try-catch blocks
- Using the catchError method
- Adding the error event listener
- Using the next() function
You can catch synchronous errors occurring in a route handler in Express by using try-catch blocks. This allows you to capture errors and handle them within your route handler function. The other options are not the typical way to catch synchronous errors in Express.
In Semantic Versioning, what does a caret (^) symbol before a version number, like ^1.2.3, signify in terms of upgrades?
- It indicates that only bug fixes and patches can be upgraded.
- It allows upgrades to the specified version and any future backward-compatible versions.
- It signifies that downgrades are allowed.
- It prevents any upgrades to the version.
The caret (^) symbol signifies that you can upgrade to the specified version and any future backward-compatible versions, including new features and non-breaking changes.
How can you set up ESLint to lint TypeScript files in a project?
- npm install --save-dev eslint @typescript-eslint/parser @typescript-eslint/eslint-plugin
- npm install --global eslint
- npm install --save-dev eslint
- npm install --save-dev eslint-plugin-typescript
To set up ESLint for TypeScript, you need to install eslint, @typescript-eslint/parser, and @typescript-eslint/eslint-plugin as dev dependencies. This combination allows ESLint to parse and analyze TypeScript code. The other options do not cover TypeScript-specific linting.
When creating a custom lifecycle script, the ______ event can be used to perform tasks after the main event has completed.
- post
- after
- complete
- finish
When creating a custom lifecycle script in Node.js, you can use the post event to perform tasks after the main event has completed. This allows you to extend or customize the behavior of existing npm lifecycle events. The other options do not represent standard event names in npm scripts.
The fs module provides both synchronous and asynchronous methods, identified by the ______ suffix for synchronous methods.
- async
- sync
- synchronous
- await
In the fs module of Node.js, synchronous methods are identified by the Sync suffix. For example, fs.readFileSync is a synchronous method for reading files, whereas asynchronous methods do not have this suffix.
Which testing framework is commonly used for writing tests in Node.js applications?
- Mocha
- Jasmine
- Jest
- Chai
Jest is a popular testing framework commonly used for writing tests in Node.js applications. It provides a comprehensive toolset for testing and is known for its simplicity and speed.
You are developing a Node.js application where you need to perform a specific action immediately after the current operation completes. How would you use the process object to schedule this action?
- process.scheduleImmediate(() => { /* Action code */ });
- process.nextTick(() => { /* Action code */ });
- process.setImmediate(() => { /* Action code */ });
- process.waitForNext(() => { /* Action code */ });
To schedule a specific action immediately after the current operation completes, you should use process.setImmediate(() => { /* Action code */ });. This ensures that the action is placed in the event queue and executed as soon as possible after the current operation. The other options do not serve this purpose correctly.
What type of files are generally served as static files in Express.js?
- HTML files
- Dynamic server scripts
- Configuration files
- Images, CSS, JavaScript
In Express.js, static files typically include images, CSS files, and JavaScript files. These files do not change dynamically and can be served directly to clients. HTML files are often dynamically generated, and configuration files are not typically served as static files.