You are creating a function that accepts an arbitrary number of arguments and returns an array of those arguments. How would you use the rest operator in this scenario to collect all the passed arguments?
- (function(...args) { return args; })
- (function(args) { return args; })
- (function([...args]) { return args; })
- (function() { return ...args; })
To create a function that accepts an arbitrary number of arguments and returns an array of those arguments, you would use the rest parameter syntax (...args) in the function's parameter list. This syntax collects all the passed arguments into an array named args. The other options are either incorrect or do not use the rest operator correctly.
The spread operator can be used to merge two ______ into a new one, combining their properties.
- Arrays
- Objects
- Strings
- Functions
The spread operator can be used to merge two "Objects" into a new one, combining their properties. It's a useful way to create a new object with properties from multiple source objects.
What is the main purpose of using mocking in unit testing?
- To simulate the behavior of external dependencies
- To improve code readability
- To optimize code execution
- To enforce code standards
Mocking in unit testing is primarily used to simulate the behavior of external dependencies, such as databases, APIs, or services, so that the unit being tested can be isolated and tested in isolation. This helps ensure that tests focus on the unit's logic without relying on the actual external dependencies.
The aud claim in a JWT token represents the ________ for which the JWT is intended.
- Audience
- Issuer
- Expiration
- Subject
The "aud" (audience) claim in a JWT (JSON Web Token) represents the intended audience for which the JWT is intended. It specifies the recipients or systems that are expected to process the token. The "iss" (issuer) claim (Option 2) identifies the entity that issued the token. The "exp" (expiration) claim (Option 3) indicates the time after which the token should not be accepted. The "sub" (subject) claim (Option 4) typically identifies the subject of the token, often the user or system the token represents.
In JavaScript, the ______ method is used to iterate over all enumerable properties of an object.
- for loop
- forEach
- while loop
- iterate
The forEach method is used in JavaScript to iterate over all enumerable properties of an object. It is commonly used with arrays to perform an action on each item. The for loop and while loop are general looping constructs and not specific to object iteration. iterate is not a standard method.
Which of the following methods in JavaScript will remove the last element from an array and return that element?
- pop()
- shift()
- splice()
- unshift()
The pop() method in JavaScript is used to remove the last element from an array and return that element. It modifies the original array by removing the last element. The other options (shift(), splice(), and unshift()) are used for different array operations.
Which of the following is true regarding built-in middlewares in Express.js?
- Built-in middlewares cannot be customized or extended.
- You can modify the behavior of built-in middlewares, but you cannot remove them.
- Built-in middlewares can be completely disabled if not needed.
- You can add custom middlewares, but built-in ones cannot be used.
In Express.js, you can completely disable built-in middlewares if they are not needed, allowing for customization and control over the middleware stack.
Which of the following is a purpose of using authentication strategies in web development?
- Ensure data integrity
- Verify the server's hardware
- Verify the client's hardware
- Verify the user's identity
Authentication strategies in web development are used to verify the user's identity. They play a crucial role in ensuring that the users accessing a system or application are who they claim to be. The other options, such as ensuring data integrity and verifying hardware, are not the primary purposes of authentication strategies.
ESLint plugins can be installed and added to the ______ array in the ESLint configuration file.
- Extends
- Plugins
- Rules
- Overrides
ESLint plugins can be installed and added to the plugins array in the ESLint configuration file. This allows you to extend ESLint's capabilities by adding custom rules or checks to your linting process. The extends option is used to extend or inherit from existing configurations. The rules option is used to configure specific ESLint rules. The overrides option is used for specifying configuration overrides for specific files or directories.
Which of the following accurately describes Non-Blocking I/O in Node.js?
- I/O operations that block the main thread
- I/O operations that execute concurrently
- I/O operations that are not supported in Node.js
- I/O operations that must be executed in a callback
Non-Blocking I/O in Node.js refers to I/O operations that execute concurrently without blocking the main thread. It allows Node.js to perform multiple I/O operations without waiting for each operation to complete. The other options describe blocking I/O or do not accurately describe non-blocking I/O.