In a scenario involving an e-commerce site, how can currying be used to handle different types of discounts for products?
- Simplifying Discount Logic and Promoting Reusability
- Increasing Code Complexity and Redundancy
- Centralizing Discount Calculation in a Single Function
- Improving Security and Authorization for Discounts
Currying enables breaking down the discount calculation into partial functions, making the logic more modular. Each partial function can handle a specific type of discount. This approach simplifies the discount management system, promotes code reusability, and allows for easier maintenance. Centralizing discount logic with currying enhances the overall flexibility and maintainability of the e-commerce application.
What is the difference between defining methods in ES5 and ES6 object literals?
- Function Declaration
- Shorthand Syntax
- Prototype Extension
- Arrow Functions
In ES6 object literals, the method definition can be written using shorthand syntax, avoiding the need for the function keyword. This not only makes the code more concise but also automatically assigns a non-enumerable property to the method, leading to improved performance.
In what ways can destructuring assignment be utilized in function parameters?
- Extract specific values
- Set default parameter values
- Both 1 and 2
- Neither 1 nor 2
Destructuring assignment in function parameters allows you to extract specific values from objects or arrays passed as arguments. Additionally, you can set default parameter values using destructuring, providing flexibility in handling different cases.
If a variable declared with const is an object or array, its properties can still be ________.
- Modified
- Deleted
- Reassigned
- Hidden
In JavaScript, when a variable is declared with const, it means the reference to the object or array is constant, not the actual content. Therefore, you can't reassign the variable, but you can still modify, delete, or add properties to the object or array.
Describe a scenario where dynamic imports would be beneficial in a server-side JavaScript environment.
- In an environment where all server-side code is loaded upfront.
- When server-side modules need to be loaded on-demand based on specific requests.
- Only in scenarios where server-side code is minimal.
- Use static imports to include all server-side modules during startup.
Dynamic imports in a server-side JavaScript environment are beneficial when specific modules are required on-demand, such as handling different types of requests. This helps optimize resource usage and improve response times in scenarios with varying workloads.
How do you remove an item from a Map in ES6?
- delete method
- remove method
- pop method
- discard method
In ES6, you can use the delete method to remove an item from a Map. This method takes the key as an argument and removes the corresponding key-value pair from the Map.
How do prototype delegation and proto property in ES6 object literals work?
- They are unrelated concepts in ES6.
- Prototype delegation is achieved through the proto property.
- The proto property is used for inheritance in object literals.
- Prototype delegation is an obsolete feature in ES6.
In ES6 object literals, the proto property is used to establish prototype delegation and achieve inheritance. The proto property allows an object to inherit properties and methods from another object, forming a prototype chain. This mechanism facilitates code reuse and promotes a more modular and extensible design. It is important to note that the proto property is considered an internal implementation detail, and using Object.create() is the recommended approach for explicit prototype delegation.
What is a common challenge or limitation associated with tree shaking in JavaScript applications?
- It may lead to unintentional removal of code with side effects
- Tree shaking is only applicable to server-side code
- It can only eliminate unused variables, not functions
- Tree shaking is only effective in minified code
One challenge with tree shaking is the potential removal of code with side effects. If not handled carefully, it may result in unintended consequences, such as eliminating code that performs actions like setting up event listeners or initializing global variables.
Can methods in ES6 classes be anonymous?
- Yes, by using the anonymous keyword
- No, all methods must have names
- Yes, by omitting the method name
- No, only functions can be anonymous
Yes, methods in ES6 classes can be anonymous by omitting the method name. However, this is not a recommended practice as it makes code less readable. Naming methods helps in understanding the purpose and functionality of the methods within a class.
The __________ is responsible for executing the code, collecting and processing events, and executing queued sub-tasks.
- Callback Queue
- Event Loop
- Promise
- Closure
The Event Loop is a crucial part of JavaScript's concurrency model. It continuously checks the Call Stack and Callback Queue, ensuring the non-blocking execution of code.