What is the primary use case for static properties in ES6 classes?
- Improve code organization
- Enable access to class-specific information
- Facilitate class inheritance
- Enhance instance-specific functionality
Static properties in ES6 classes are used primarily to facilitate class inheritance. They allow sharing of properties among all instances of a class and provide a common base for subclasses. This improves code organization and promotes the reusability of code in an object-oriented manner.
The __________ file in a module directory helps in defining the entry point for the module in ES6.
- main.js
- module.js
- index.js
- entry.js
In ES6, the index.js file serves as the default entry point for a module within a directory. It is automatically recognized when importing the module.
How can enhanced object literals in ES6 improve the process of creating objects that inherit from another object?
- Facilitates concise syntax for defining the prototype chain
- Enables automatic inheritance through the extends keyword
- Introduces mixins for flexible composition of properties
- Provides a dedicated Object.extend method for inheritance
Enhanced object literals in ES6 simplify the process of creating objects that inherit from another object by providing a concise syntax for defining the prototype chain. This concise syntax enhances code readability and reduces the boilerplate code associated with prototype-based inheritance, making it more accessible and efficient.
In a scenario where you need to create multiple objects with similar properties and methods, how would you utilize ES6 classes to achieve this?
- Prototypal Inheritance
- Object Factories
- Constructor Functions
- ES6 Classes
In ES6, classes provide a cleaner syntax for creating objects with shared properties and methods. Options A, B, and C are also ways to achieve object creation, but ES6 classes offer a more concise and structured approach.
Arrow functions do not have their own this keyword; instead, they ________ the this value from the enclosing execution context.
- Absorb
- Inherit
- Borrow
- Capture
Arrow functions in JavaScript do not have their own this context. Instead, they inherit the this value from the enclosing execution context. This behavior is different from regular functions, which have their own this binding.
What are the limitations of destructuring assignment when dealing with complex data structures?
- Limited support for nested structures
- Inability to rename variables
- Difficulty in handling arrays
- All of the above
Destructuring assignment may face limitations with complex nested structures, making it challenging to destructure deeply nested objects or arrays. Additionally, it lacks the ability to rename variables, and handling arrays can be trickier in certain scenarios.
What is the purpose of the WeakMap and WeakSet in ES6 compared to Map and Set?
- They have better performance characteristics for certain use cases.
- They are used for storing weakly held references to objects.
- They have additional methods for manipulating keys and values.
- They have stricter key equality rules.
WeakMap and WeakSet are designed for scenarios where you want to associate additional data with objects without preventing garbage collection. They are used for weakly held references.
When destructuring function parameters, _________ can be used to handle undefined input.
- Default parameter
- Optional chaining
- Nullish coalescing
- Early binding
When destructuring function parameters, the correct option is the "Default parameter." Default parameters in JavaScript allow you to provide a default value for a function parameter if no value or undefined is passed. This helps in handling undefined input gracefully.
In ES6, you can directly assign ________ to object properties without repeating the variable name.
- Destructuring
- Shorthand Notation
- Computed Property Names
- Arrow Functions
In ES6, destructuring allows you to directly assign values from objects or arrays to variables, making code concise and readable. Shorthand notation is commonly used for this purpose.
What is a key difference between a JavaScript Object and a Map?
- Properties order, properties, ordering, key-value pairs
- Key-value pairs, properties, ordering, properties order
- Properties order, properties, key-value pairs, ordering
- Key-value pairs, ordering, properties order, properties
In JavaScript, the key difference between an Object and a Map lies in the ability to use any data type as the key in a Map, providing a more flexible and reliable data structure for certain use cases. While Objects are limited to string and symbol keys, Maps allow any data type as keys, allowing for better handling of key-value pairs.