How can you handle error responses in Express for cleaner error reporting?
- Using the throw statement
- Using the try...catch block
- Implementing custom error handling middleware
- Ignoring errors for cleaner logs
To handle error responses in Express for cleaner error reporting, you can implement custom error handling middleware. This middleware can catch errors and provide a standardized way to handle and respond to them, improving error reporting and debugging.
How can you match routes with a specific pattern in Express.js?
- app.pattern('/route', callback)
- app.match('/route', callback)
- app.use('/route', callback)
- app.get('/route', callback)
In Express.js, you can use the app.get('/route', callback) method to match routes with a specific pattern. The get method is used to handle HTTP GET requests and is often used to define routes with specific patterns. The other options do not represent the standard way to define route patterns in Express.js.
To handle HTTP POST requests in Express, you would use the ______ method.
- GET
- POST
- PUT
- DELETE
To handle HTTP POST requests in Express, you would use the POST method. The POST method is used for submitting data to be processed to a specified resource.
How does Content Security Policy (CSP) help in preventing XSS attacks, and what are its limitations?
- CSP restricts the usage of third-party libraries
- CSP blocks all JavaScript execution
- CSP defines rules for resource loading and script execution
- CSP is ineffective against XSS attacks
Content Security Policy (CSP) helps prevent Cross-Site Scripting (XSS) attacks by defining rules for resource loading and script execution in web applications. It can restrict the sources from which scripts can be executed, mitigating the risk of malicious script injection. However, CSP has limitations, such as its inability to prevent all forms of XSS attacks, the need for careful configuration, and potential compatibility issues with legacy code.
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.
What happens when you try to access an index in a buffer that does not exist in Node.js?
- It returns null
- It throws an "IndexOutOfRange" error
- It returns an "undefined" value
- It automatically resizes the buffer
When you try to access an index in a buffer that does not exist, Node.js throws an "IndexOutOfRange" error. Buffers do not automatically resize.
When using the map method on an array in JavaScript, the original array ______ be mutated.
- may
- will
- must
- can't
When using the map method on an array in JavaScript, the original array can't be mutated. The map method creates a new array with the results of calling a provided function on every element in the original array without changing the original array itself.
Which of the following is a suitable method to prevent variable leakage in the global scope?
- Using the var keyword to declare variables.
- Using immediately-invoked function expressions (IIFE).
- Using global variables exclusively.
- Using let and const keywords to declare variables.
Using immediately-invoked function expressions (IIFE) is a common technique to prevent variable leakage into the global scope. It encapsulates variables within a function scope, avoiding global pollution. The other options do not address this concern effectively.
How can you install ESLint in your Node.js project?
- Using npm or yarn: npm install eslint --save-dev or yarn add eslint --dev
- Downloading it from the official website
- Installing it globally using npm install -g eslint
- Adding it directly to your HTML file
You can install ESLint in your Node.js project using npm or yarn by running the command npm install eslint --save-dev or yarn add eslint --dev. This ensures that ESLint is added as a development dependency for your project.