When using super in a constructor, it initializes the _______ of the derived class.
- Properties
- Constructor
- State
- Methods
In a derived class constructor, super initializes the properties of the derived class, calling the constructor of the parent class. This sets up the state for the derived class.
What is a key feature of arrow functions regarding the handling of the this keyword?
- They bind the this keyword dynamically
- They do not have access to the this keyword
- They always refer to the this of the global object
- They bind the this keyword statically
Arrow functions do not have their own this context; instead, they inherit the this value from the surrounding lexical scope. This is a crucial feature that can prevent the common issue of losing the correct this context in nested functions.
How does the Symbol type interact with the Object.getOwnPropertySymbols() method?
- It returns an array of all symbol properties found directly upon the given object.
- It throws an error since symbols are not enumerable.
- It returns an object containing all symbol properties found directly upon the given object.
- It only returns symbols with specific descriptors.
The Object.getOwnPropertySymbols() method returns an array of all symbol properties found directly upon the given object, regardless of their enumerability. It allows you to access symbols that are not enumerable in regular object iteration.
The _________ pattern in ES6 is a design pattern used to compose objects from small reusable components.
- Factory
- Composite
- Mixin
- Observer
The correct option is Mixin. In ES6, the Mixin pattern involves composing objects by combining small, reusable components. This allows for better code organization and reusability. Mixins are a way to enhance a class with the methods of another class without the need for inheritance.
Can you access instance properties from a static method?
- Yes, using the this keyword.
- No, it results in a runtime error.
- Yes, using the super keyword.
- No, instance properties are inaccessible.
No, you cannot access instance properties directly from a static method. Static methods are associated with the class itself and do not have access to instance-specific data. Option D is correct.
What is a mixin in the context of JavaScript ES6?
- A way to create variables in ES6
- A function that takes two objects and returns a new object
- A method for adding properties and methods to a class
- A type of loop in ES6
In JavaScript ES6, a mixin is a way to compose classes by adding properties and methods to a class. It allows the reuse of functionalities and promotes code reusability. Unlike inheritance, mixins do not rely on a hierarchical relationship between classes. They enhance the flexibility and maintainability of code.
How do default parameters interact with destructuring assignment in function arguments?
- They can't be used together
- Destructuring assignment takes precedence
- The function ignores the default parameters
- Destructuring is not supported in ES6
Default parameters and destructuring can be used together, and destructuring takes precedence. Explanation should elaborate on how they work together.
When using mixins in ES6, the mixin's methods can conflict with the _________ of the target class.
- Methods
- Properties
- Constructors
- Inheritance
The correct option is Properties. When using mixins in ES6, there can be conflicts between the properties of the mixin and the target class. It's important to handle these conflicts appropriately to ensure the correct behavior of the composed object.
How does the rest operator differ from the spread operator in its syntax?
- It uses the same syntax as the spread operator
- It uses the same syntax as the spread operator but with an extra parameter
- It uses a different syntax with three dots (...)
- It doesn't exist in ES6
The rest operator also uses three dots (...) but in a different context. It is used to represent an indefinite number of arguments as an array in function parameters, providing a more concise syntax for working with variadic functions.
What is a common way to handle errors in async/await functions?
- try...except
- errorHandling
- catch
- handleError
In async/await functions, the common way to handle errors is by using the try...catch block. This allows you to wrap the asynchronous code within the try block and catch any errors that may occur during its execution. The catch block is then used to handle and respond to those errors.