What would be the best way to handle errors in an Express application when building RESTful APIs?
- Using try...catch blocks in route handlers
- Sending 404 Not Found for all errors
- Using console.log() for error messages
- Not handling errors, let them crash the server
The best way to handle errors in an Express application when building RESTful APIs is to use try...catch blocks in route handlers. This allows you to catch errors and send appropriate HTTP responses with error details. Sending 404 Not Found for all errors is not a good practice, and letting errors crash the server is even worse. Console.log() is generally used for debugging but not for handling errors.
To override ESLint rules for specific files or directories, you can create a .eslintignore or ______ file with the patterns of the files or directories to be excluded.
- .eslintrc.js
- .eslintignore
- .eslintconfig
- .eslintexclude
To override ESLint rules for specific files or directories, you can create a .eslintignore file with patterns of the files or directories to be excluded from ESLint linting. The other options are not used for this purpose.
Which of the following events is emitted when data is available to read from a readable stream?
- data
- readable
- onData
- available
In Node.js, the 'data' event is emitted when data is available to read from a readable stream. This event allows you to consume the data as it becomes available. The other options are not standard events for this purpose.
In a sharded database architecture, how are Update operations handled across multiple shards?
- Updates are broadcast to all shards
- A central coordinator handles all updates
- Each shard independently handles updates for its data
- Updates are queued and processed sequentially
In a sharded database architecture, a central coordinator (Option 2) often handles updates that affect multiple shards. Each shard (Option 3) independently handles updates for its own data, but coordinated updates across shards typically require a central component. Options 1 and 4 are not common methods for handling updates in sharded databases.
Which command is used to publish a package to the NPM registry?
- npm upload
- npm publish
- npm send
- npm push
To publish a package to the NPM registry, you should use the npm publish command. This command packages and uploads your module to the NPM registry, making it available for others to use and install. Options 1, 3, and 4 are not valid commands for publishing packages and might lead to errors.
How can optimizing database queries significantly reduce the response time of an application?
- Optimizing queries can make the code more readable but doesn't affect response time.
- Optimizing queries can reduce the number of database calls and minimize data retrieval, improving response time.
- Optimizing queries doesn't impact response time; it only reduces server memory usage.
- Optimizing queries can speed up server initialization but has no effect on response time.
Optimizing database queries can significantly reduce response time by minimizing the number of database calls, reducing data retrieval, and improving the efficiency of data fetching, ultimately leading to faster responses. The other options either misrepresent the impact of query optimization or provide irrelevant information.
When performing file operations using the fs module, handling ______ errors is crucial to ensure data integrity.
- synchronous
- asynchronous
- promise
- event
When working with file operations in Node.js using the fs module, handling asynchronous errors is crucial. Asynchronous file operations can fail due to various reasons such as file not found, permission issues, or disk full errors. Proper error handling ensures data integrity and prevents unexpected crashes in your application.
How can you define optional route parameters in Express.js?
- Enclose parameters in square brackets [param]
- Use the optional keyword before the parameter
- Use the ? symbol after the parameter
- Wrap parameters in parentheses (param)
In Express.js, you can define optional route parameters by using the ? symbol after the parameter name, like /route/:param?. This makes the parameter optional, allowing it to match both routes with and without that parameter. The other options do not represent the correct way to define optional route parameters in Express.js.
You are creating a build for a production environment and realize that some of the devDependencies are being included in the build, causing it to be bulkier. What steps would you take to rectify this?
- Manually remove devDependencies from package.json
- Use Webpack to exclude devDependencies
- Use the npm prune --production command
- Upgrade all devDependencies to their latest versions
To rectify this issue, you should use the npm prune --production command. This command removes unnecessary devDependencies from your node_modules directory, ensuring that only production dependencies are included in the build. Options (1) and (4) are not recommended because manually removing or upgrading devDependencies can be error-prone. Option (2) doesn't directly address the issue, and Webpack is typically used for bundling rather than dependency management.
You are developing an e-commerce application where multiple API calls are made to fetch product details. How can you efficiently handle multiple Promises to ensure that even if one fails, others continue execution?
- Promise.allSettled()
- Promise.race()
- Promise.all()
- Promise.any()
In this scenario, you can efficiently handle multiple Promises using Promise.allSettled(). This method returns an array of results for all Promises, allowing you to handle both resolved and rejected Promises without stopping the execution of others. Promise.race() would stop execution on the first rejection, Promise.all() requires all to resolve, and Promise.any() stops on the first resolution.