Q51. What is `set` keyword in JavaScript classes?
The `set` keyword is used to define a method that sets the value of a property. When the property is assigned a value, the `set` method is automatically called, and it ca...
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Q52. Can you explain the concept of instance variables in a class in JavaScript?
In JavaScript, instance variables are properties of an object that are specific to an instance of a class. When we create a new instance of a class using the `new` keywor...
Q53. What is the difference between a class and a function in JavaScript?
functions and classes are both important tools in JavaScript for defining reusable code, but they serve different purposes. Functions are used to encapsulate logic and pe...
Q54. What is abstract class in JavaScript?
In JavaScript, an abstract class is a blueprint for creating other classes that share some common properties and methods. However, unlike regular classes, abstract classe...
Q55. What is the difference between a class and an interface in JavaScript?
Classes and interfaces are both used in JavaScript to define object types, but serve different purposes. A class defines a blueprint for creating objects that have proper...
Q56. Can you explain the concept of polymorphism in classes in JavaScript?
Polymorphism in JavaScript classes means that different objects can share the same methods, even if they belong to different classes. This allows us to reuse code across ...
Q57. What is the difference between prototypal inheritance and classical inheritance?
The main difference between prototypal and classical inheritance is that prototypal inheritance allows objects to inherit properties and methods directly from other objec...
Q58. What is a character class in regular expressions?
A character class in regular expressions is a set of characters that can be matched in a single position in the text. It is denoted by enclosing the characters in square ...
Q59. How do you specify a range of characters in a character class?
In a character class, you can specify a range of characters by using a hyphen (-) between two characters. For example, the regular expression "[a-z]" matches any lowercas...