ES6 Interview Questions to be asked in 2023

ECMAScript 6 (ES6) is a version of the ECMAScript language specification. It was released in 2015 and is the latest version of the language.

ES6 introduced many new features to the JavaScript language, including:

• Classes
• Arrow functions
• Promises
• Modules
• Destructuring
• Spread operator
• Template literals

These features make it easier for developers to write complex and scalable applications.

ES6 is important for software development because it represents a significant evolution of the JavaScript language. It makes it easier for developers to write code that is easier to understand, maintain, and scale. It is especially useful for building modern web applications that are interactive and feature-rich.

For software developers, it is important to have a good understanding of ES6 because it is widely used in the industry. Many modern libraries and frameworks are built using ES6, and many job postings for software developers require familiarity with it. Learning ES6 will also make it easier for you to learn and use these libraries and frameworks.

1. What is ECMAScript 6 (ES6) and how does it differ from previous versions of JavaScript?
2. Can you explain the concept of let and const in ES6?
3. How do you define a class in ES6 and what are the main features of a class?
4. Can you explain the difference between a class and a constructor function in ES6?
5. Can you explain the concept of inheritance in ES6 classes and how it works?
6. Can you explain the concept of arrow functions in ES6 and how they differ from traditional functions?
7. Can you explain the concept of default function parameters in ES6 and how they work?
8. Can you explain the concept of rest parameters in ES6 and how they differ from the arguments object?
9. Can you explain the concept of spread operator in ES6 and how it can be used?
10. Can you explain the concept of template literals in ES6 and how they can be used?
11. Can you explain the concept of destructuring in ES6 and how it can be used to extract values from arrays and objects?
12. Can you explain the concept of promises in ES6 and how they can be used to handle asynchronous operations?
13. Can you explain the concept of async/await in ES6 and how it simplifies the use of promises?
14. Can you explain the concept of generators in ES6 and how they can be used to create custom iterators?
15. Can you explain the concept of modules in ES6 and how they can be used to organize code in a project?
16. Can you explain the concept of named exports and default exports in ES6 modules?
17. Can you explain the concept of import and export in ES6 modules and how they work?
18. Can you explain the concept of object shorthand notation in ES6 and how it can be used to simplify object property assignments?
19. Can you explain the concept of computed property names in ES6 and how they can be used to create dynamic object property names?
20. Can you explain the concept of for-of loop in ES6 and how it can be used to iterate over collections?
21. Can you explain the concept of symbol type in ES6 and how it can be used to create unique identifiers?
22. Can you explain the concept of iterator protocol in ES6 and how it can be used to create custom iterables?
23. Can you explain the concept of getters and setters in ES6 and how they can be used to define computed properties?
24. Can you explain the concept of super keyword in ES6 and how it can be used to access the parent class?
25. Can you explain the concept of extends keyword in ES6 and how it can be used to create a subclass?
26. Can you explain the concept of mixins in ES6 and how they can be used to share behavior between classes?
27. Can you explain the concept of decorators in ES6 and how they can be used to modify the behavior of a class or method?
28. Can you explain the concept of polymorphism in ES6 and how it can be achieved using inheritance and method overriding?
29. Can you explain the concept of encapsulation in ES6 and how it can be achieved using private methods and properties?
30. Can you explain the concept of abstract classes in ES6 and how they can be used to define a base class with abstract methods?
31. Can you explain the concept of static methods and properties in ES6 and how they can be used in a class?
32. Can you explain the concept of type coercion in JavaScript and how it can be avoided in ES6 using type guards?
33. Can you explain the concept of type assertions in TypeScript and how they can be used to assert the type of a value?
34. Can you explain the concept of type inference in TypeScript and how it can be used to infer the type of a value?
35. Can you explain the concept of type compatibility in TypeScript and how it can be used to check if two types are compatible?
36. Can you explain the concept of union types in TypeScript and how they can be used to represent multiple types for a single value?
37. Can you explain the concept of intersection types in TypeScript and how they can be used to intersect multiple types?
38. Can you explain the concept of type aliasing in TypeScript and how it can be used to create custom types?
39. Can you explain the concept of type guards in TypeScript and how they can be used to narrow the type of a value?
40. Can you explain the concept of type predicates in TypeScript and how they can be used to check the type of a value?
41. Can you explain the concept of type parameters in TypeScript and how they can be used to create generic types?
42. Can you explain the concept of type inference in TypeScript and how it can be used to infer the type of a value?
43. Can you explain the concept of type inference in TypeScript and how it can be used to infer the type of a value?
44. Can you explain the concept of discriminated unions in TypeScript and how they can be used to model complex type hierarchies?
45. Can you explain the concept of mapped types in TypeScript and how they can be used to create new types from existing ones?
46. Can you explain the concept of index types in TypeScript and how they can be used to create types that allow dynamic property access?
47. Can you explain the concept of type inference in TypeScript and how it can be used to infer the type of a value?