Here are some of the basic interview questions and answers asked in TypeScript interviews.<\/p>\n
1. What is TypeScript?<\/strong><\/p>\n Answer:<\/strong> TypeScript is a statically- superset of JavaScript that adds features to JavaScript to help developers write more robust and maintainable code.<\/p>\n 2. What is the difference between TypeScript and JavaScript?<\/strong><\/p>\n Answer:<\/strong> TypeScript is a superset of JavaScript that adds features to JavaScript to help developers write more robust and maintainable code. JavaScript has dynamic typing, but TypeScript has static typing.<\/p>\n 3. How is TypeScript compiled?<\/strong><\/p>\n Answer:<\/strong> TypeScript is compiled into JavaScript code using the TypeScript compiler.<\/p>\n 4. What is a type in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A type in TypeScript refers to the type of a value, such as a number, string, or boolean.<\/p>\n 5. In TypeScript, what distinguishes a type from an interface?<\/strong><\/p>\n Answer:<\/strong> An interface in TypeScript is a way to describe the shape of an object, while a type is a way to describe the type of a value.<\/p>\n 6. What is a class in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A class in TypeScript is a blueprint for creating objects that share the same properties and methods.<\/p>\n 7. What is a module in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A module in TypeScript is a way to organize code into separate files and namespaces.<\/p>\n 8. What is the difference between a namespace and a module in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A namespace in TypeScript is a way to group related code into a single global scope. A module is a way to organize code into separate files and namespaces.<\/p>\n 9. What is a decorator in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A decorator in TypeScript is a special kind of declaration that can be attached to a class declaration, method, accessor, property, or parameter.<\/p>\n 10. What is the purpose of a decorator in TypeScript?<\/strong><\/p>\n Answer:<\/strong> The purpose of a decorator in TypeScript is to modify the behavior of a class or its members without having to modify the original source code.<\/p>\n 11. What distinguishes a TypeScript abstract class from an interface?<\/strong><\/p>\n Answer:<\/strong> An abstract class in TypeScript can have implementation details, while an interface cannot. An abstract class can also be extended, while an interface can be implemented.<\/p>\n 12. What is a generic in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A generic in TypeScript is a type that can be used with multiple types.<\/p>\n 13. What is a union type in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A union type in TypeScript allows a value to have more than one type.<\/p>\n 14. What is an intersection type in TypeScript?<\/strong><\/p>\n Answer:<\/strong> An intersection type in TypeScript allows a value to have multiple types.<\/p>\n 15. What is a type assertion in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A type assertion in TypeScript is a way to tell the TypeScript compiler the type of a value.<\/p>\n 16. What is a type guard in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A type guard in TypeScript is a way to narrow the type of a value based on a condition.<\/p>\n 17. What is a type alias in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A type alias in TypeScript is a way to create a named alias for a type.<\/p>\n 18. What is the difference between a type alias and an interface in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A type alias in TypeScript is more flexible than an interface because it can be used with any type, not just objects. A type alias can also be used to create union and intersection types.<\/p>\n 19. What is a declaration file in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A declaration file in TypeScript is a file that describes the shape of a JavaScript module or library.<\/p>\n 20. How is a declaration file used in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A declaration file is used by the TypeScript compiler to provide type information for JavaScript modules or libraries.<\/p>\n 21. What is a type parameter in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A type parameter in TypeScript is a placeholder for a type that can be specified later.<\/p>\n 22. What is the difference between an arrow and regular functions in TypeScript?<\/strong><\/p>\n Answer:<\/strong> An arrow function in TypeScript is more concise than a regular function and does not require a separate this binding. Arrow functions also cannot be used as constructors.<\/p>\n 23. What is an optional parameter in TypeScript?<\/strong><\/p>\n Answer:<\/strong> An optional parameter in TypeScript is a parameter that can be omitted when calling a function.<\/p>\n 24. What is a default parameter in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A default parameter in TypeScript is a parameter that has a default value that is used if no value is provided when calling the function.<\/p>\n 25. What is a rest parameter in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A rest parameter in TypeScript is a parameter that allows a function to accept an indefinite number of arguments as an array.<\/p>\n 26. What is a readonly property in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A readonly property in TypeScript is a property that can only be set once, either at initialization or in the constructor.<\/p>\n 27. What is a private property in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A private property in TypeScript is a property that can only be accessed within the same class.<\/p>\n 28. What is a protected property in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A protected property in TypeScript is a property that can only be accessed within the same class or its subclasses.<\/p>\n 29. What is a public property in TypeScript? <\/strong><\/p>\n Answer<\/strong>: A public property in TypeScript is a property that can be accessed from anywhere.<\/p>\n 30. What is a getter in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A getter in TypeScript is a method that is used to retrieve the value of a property.<\/p>\n 31. What is a setter in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A setter in TypeScript is a method that is used to set the value of a property.<\/p>\n 32. What is an abstract method in TypeScript?<\/strong><\/p>\n Answer:<\/strong> An abstract method in TypeScript is a method that does not have an implementation and must be implemented by a subclass.<\/p>\n 33. What is an async function in TypeScript?<\/strong><\/p>\n Answer:<\/strong> An async function in TypeScript is a function that returns a Promise and can use the await keyword to wait for other asynchronous functions to complete.<\/p>\n 34. What is a Promise in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A Promise in TypeScript is an object that represents the eventual completion (or failure) of an asynchronous operation and allows for more readable and maintainable asynchronous code.<\/p>\n 35. What is a callback function in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A callback function in TypeScript is a function that is passed as an argument to another function and is called when that function completes.<\/p>\n 36. What is a higher-order function in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A higher-order function in TypeScript is a function that takes one or more functions as arguments or returns a function as its result.<\/p>\n 37. What is the never type in TypeScript?<\/strong><\/p>\n Answer:<\/strong> The never type in TypeScript represents a value that will never occur, such as the result of a function that always throws an error.<\/p>\n 38. What is a type predicate in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A type predicate in TypeScript is a function that returns a boolean and is used to narrow the type of a value.<\/p>\n 39. What is a type operator in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A type operator in TypeScript is a keyword or symbol that is used to manipulate types, such as the typeof operator or the keyof operator.<\/p>\n 40. What is a tuple in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A tuple in TypeScript is an array with a fixed number of elements; each element can have a different type.<\/p>\n 41. What is a namespace in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A namespace in TypeScript is a way to group related code into a single global scope.<\/p>\n 42. What is a module in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A module in TypeScript is a way to organize code into separate files and namespaces.<\/p>\n 43. What is the export keyword in TypeScript?<\/strong><\/p>\n Answer:<\/strong> The export keyword in TypeScript is used to export functions, classes, variables, or interfaces from a module so they can be used in other modules.<\/p>\n 44. What is the import keyword in TypeScript?<\/strong><\/p>\n Answer:<\/strong> The import keyword in TypeScript is used to import functions, classes, variables, or interfaces from other modules.<\/p>\n 45. What is a type alias in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A type alias in TypeScript is a way to give a name to a type that is used frequently throughout a codebase.<\/p>\n 46. What is a type assertion in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A type assertion in TypeScript is a way to tell the compiler the type of a value when the compiler cannot infer it automatically.<\/p>\n 47. What is a declaration file in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A declaration file in TypeScript is a file that contains type information for JavaScript code.<\/p>\n 48. What is an interface in TypeScript?<\/strong><\/p>\n Answer:<\/strong> An interface in TypeScript is a way to define the shape of an object, including its properties and methods.<\/p>\n 49. What is a class in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A class in TypeScript is a blueprint for creating objects that encapsulate data and behavior.<\/p>\n 50. What is inheritance in TypeScript?<\/strong><\/p>\n Answer:<\/strong> Inheritance in TypeScript is a way to create a new class that is a modified version of an existing class, inheriting its properties and methods.<\/p>\n 51. What is encapsulation in TypeScript?<\/strong><\/p>\n Answer:<\/strong> Encapsulation in TypeScript is the concept of hiding the internal implementation of a class from external code, so that the class can be modified without affecting other parts of the codebase.<\/p>\n 52. What is polymorphism in TypeScript?<\/strong><\/p>\n Answer:<\/strong> Polymorphism in TypeScript is the ability of a class to take on multiple forms, depending on the context in which it is used.<\/p>\n 53. What is a constructor in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A constructor in TypeScript is a special method that is called when an object of a class is created, and is used to set the initial state of the object.<\/p>\n 54. What is the super keyword in TypeScript?<\/strong><\/p>\n Answer:<\/strong> The super keyword in TypeScript is used to call a method or constructor from the parent class.<\/p>\n 55. What is a static property or method in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A static property or method in TypeScript is a property or method that belongs to the class itself, rather than to instances of the class.<\/p>\n 56. What is a decorator in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A decorator in TypeScript is a way to modify the behavior of a class, method, or property, by adding metadata.<\/p>\n 57. What is a generic type in TypeScript?<\/strong><\/p>\n Answer:<\/strong> A generic type in TypeScript is a way to create a type that can be used with multiple types.<\/p>\n 58. What distinguishes type from interface in TypeScript?<\/strong><\/p>\n Answer:<\/strong> The interface keyword in TypeScript is used to define the shape of an object, while the type keyword is used to create a type alias for a specific type.<\/p>\n 59. What is the difference between private and protected in TypeScript?<\/strong><\/p>\n Answer:<\/strong> The private keyword in TypeScript makes a property or method accessible only within the same class, while the protected keyword allows access within the same class and its subclasses.<\/p>\n 60. What is the difference between var, let, and const in TypeScript?<\/strong><\/p>\n Answer<\/strong>: The var keyword in TypeScript is used to declare a variable with function scope, while the let and const keywords declare variables with block scope. The let keyword allows the variable to be reassigned, while the const keyword creates a variable with a value that cannot be changed.<\/p>\n Hope this article helped you in learning basic TypeScript Interview Questions and Answers. Do not forget to check our advanced level of TypeScript Interview<\/p>\n","protected":false},"excerpt":{"rendered":" Here are some of the basic interview questions and answers asked in TypeScript interviews. TypeScript Interview Questions and Answers 1. What is TypeScript? Answer: TypeScript is a statically- superset of JavaScript that adds features...<\/p>\n","protected":false},"author":581,"featured_media":113162,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[27319],"tags":[27370,27369],"class_list":["post-113040","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-typescript-tutorials","tag-typescript-interview-questions-and-answers","tag-typescripts-interview-questions"],"yoast_head":"\nSummary<\/h3>\n