{"id":10205,"date":"2023-05-02T07:02:27","date_gmt":"2023-05-02T07:02:27","guid":{"rendered":"https:\/\/www.scmgalaxy.com\/tutorials\/?p=10205"},"modified":"2023-06-19T13:29:49","modified_gmt":"2023-06-19T13:29:49","slug":"top-50-type-script-interview-questions-with-answers","status":"publish","type":"post","link":"https:\/\/www.scmgalaxy.com\/tutorials\/top-50-type-script-interview-questions-with-answers\/","title":{"rendered":"Top 50 Type Script Interview Questions with Answers"},"content":{"rendered":"<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2023\/05\/image-32-1024x366.png\" alt=\"\" class=\"wp-image-10206\" width=\"798\" height=\"285\" srcset=\"https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2023\/05\/image-32-1024x366.png 1024w, https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2023\/05\/image-32-300x107.png 300w, https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2023\/05\/image-32-768x274.png 768w, https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2023\/05\/image-32-1536x548.png 1536w, https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2023\/05\/image-32-2048x731.png 2048w\" sizes=\"auto, (max-width: 798px) 100vw, 798px\" \/><figcaption class=\"wp-element-caption\"><strong><em>Type Script Interview Questions with Answers<\/em><\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\">1. What is Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) A scripting language<br>b) A superset of JavaScript<br>c) A programming language<br>d) A markup language<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">2. Which file extension is used for Typescript files?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) .js<br>b) .ts<br>c) .html<br>d) .css<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">3. Which of the following is NOT a primitive type in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) number<br>b) string<br>c) boolean<br>d) object<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">4. Which keyword is used to declare a variable in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) var<br>b) let<br>c) const<br>d) All of the above<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">5. What is the difference between let and const keywords in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) let is used for variables that can be reassigned, while const is used for variables that cannot be reassigned<br>b) const is used for variables that can be reassigned, while let is used for variables that cannot be reassigned<br>c) let and const are interchangeable keywords<br>d) There is no difference between let and const in Typescript<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">6. Which Keyword is used to define a function in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) function<br>b) def<br>c) fn<br>d) All of the above<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">7. Which keyword is used to create an interface in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) interface<br>b) class<br>c) types<br>d) type<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">8. What is an interface in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) A blueprint for an object that describes its shape and properties<br>b) A function that returns a boolean value<br>c) An instruction to the Typescript compiler<br>d) A method for accessing object properties<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">9. Which keyword is used to create a class in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) class<br>b) interface<br>c) function<br>d) type<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">10. What is a class in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) A template for creating objects<br>b) A function that returns a value<br>c) A grouping of related variables<br>d) A way to organize code<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">11. Which keyword is used to extend a class in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) extends<br>b) expands<br>c) appliesTo<br>d) inherits<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">12. What is inheritance in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) The process of creating new classes from existing classes<br>b) The process of creating new variables from existing variables<br>c) The process of creating new interfaces from existing interfaces<br>d) The process of creating new functions from existing functions<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">13. What is polymorphism in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) The ability of an object to take multiple forms<br>b) The ability of a function to take multiple parameters<br>c) The ability of a variable to store multiple values<br>d) The ability of an interface to have multiple implementations<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">14. Which keyword is used to implement an interface in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) implements<br>b) appliesTo<br>c) integrates<br>d) extends<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">15. What is a module in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) A way to organize code into separate files<br>b) A way to create object instances<br>c) A way to define interfaces<br>d) A way to create classes<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">16. Which keyword is used to import a module in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) import<br>b) include<br>c) require<br>d) add<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">17. Which keyword is used to export a module in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) export<br>b) include<br>c) require<br>d) add<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">18. Which operator is used to declare a nullable variable in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) ?<br>b) !<br>c) #<br>d) *<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">19. Which operator is used to access a property of a nullable object in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) ?<br>b) !<br>c) #<br>d) *<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">20. Which built-in object is used for iterating over arrays in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) Array<br>b) ForEach<br>c) Iterator<br>d) None of the above<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">21. Which built-in object is used for iterating over objects in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) Object<br>b) ForEach<br>c) Iterator<br>d) None of the above<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">22. What is a namespace in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) A way to organize code into logical groups<br>b) A way to declare variables<br>c) A way to define interfaces<br>d) A way to create classes<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">23. What is an enum in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) A way to define a set of related constants<br>b) A way to define a set of related variables<br>c) A way to define a set of related interfaces<br>d) A way to define a set of related classes<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">24. Which keyword is used to declare an enum in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) enum<br>b) class<br>c) interface<br>d) type<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">25. Which of the following is NOT a valid access modifier in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) public<br>b) private<br>c) protected<br>d) final<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">26. What is a decorator in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) A special type of declaration that can be attached to a class declaration, method, accessor, property, or parameter<br>b) A way to access object properties<br>c) A way to define interfaces<br>d) A way to create classes<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">27. Which built-in decorator is used to mark a method or accessor as a getter?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) @get<br>b) @getter<br>c) @getAccessor<br>d) @property<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">28. Which built-in decorator is used to mark a method or accessor as a setter?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) @set<br>b) @setter<br>c) @setAccessor<br>d) @property<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">29. Which built-in decorator is used to mark a class as abstract?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) @abstract<br>b) @abstractClass<br>c) @isAbstract<br>d) @class<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">30. What is an abstract class in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) A class that cannot be instantiated and serves as a base class for other classes<br>b) A class that can be instantiated and serves as a base class for other classes<br>c) A class that is marked with the @abstract decorator<br>d) A class that has all abstract methods<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">31. Which built-in decorator is used to mark a method or class as deprecated?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) @deprecated<br>b) @deprecate<br>c) @obsolete<br>d) @old<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">32. What is a type assertion in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) A way to tell the compiler the type of a variable when Typescript cannot infer it<br>b) A way to access object properties<br>c) A way to define interfaces<br>d) A way to create classes<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">33. Which operator is used for type assertion in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) !<br>b) ?<br>c) #<br>d) *<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">34. What is a tuple in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) An array with a fixed number of elements and specified types for each element<br>b) An object with a fixed number of properties and specified types for each property<br>c) A type of variable that can store either a number or a string<br>d) A type of function that takes no arguments and returns nothing<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">35. Which built-in method is used to find the index of an element in an array in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) indexOf<br>b) findIndex<br>c) forEach<br>d) map<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">36. Which built-in method is used to find an element in an array in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) indexOf<br>b) findIndex<br>c) find<br>d) map<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">37. Which built-in method is used to filter elements from an array in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) filter<br>b) slice<br>c) map<br>d) reduce<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">38. Which built-in method is used to concatenate multiple arrays into a single array in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) concat<br>b) join<br>c) push<br>d) splice<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">39. What is a generic in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) A parameterized type that can be used to create reusable code<br>b) A function that returns a boolean value<br>c) A type of variable that can store either a number or a string<br>d) A type of function that takes no arguments and returns nothing<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">40. Which keyword is used to declare a generic type in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) generic<br>b) type<br>c) T<br>d) var<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">41. Which built-in function is used to iterate over the properties of an object in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) Object.keys()<br>b) Object.values()<br>c) Object.entries()<br>d) None of the above<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">42. Which built-in function is used to get the length of an array in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) array.length()<br>b) array.size()<br>c) array.count()<br>d) array.length<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">43. Which built-in function is used to sort an array in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) array.sort()<br>b) array.filter()<br>c) array.map()<br>d) None of the above<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">44. Which built-in function is used to reverse an array in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) array.reverse()<br>b) array.sort()<br>c) array.map()<br>d) None of the above<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">45. What is the difference between any and unknown types in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) any type allows any value, while unknown type requires a type assertion or type guard before being assigned<br>b) unknown type allows any value, while any type requires a type assertion or type guard before being assigned<br>c) any and unknown types are interchangeable<br>d) There is no difference between any and unknown types in Typescript<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">46. What is a type guard in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) A way to narrow down the type of a variable within a conditional statement<br>b) A way to access object properties<br>c) A way to define interfaces<br>d) A way to create classes<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">47. Which built-in function is used to convert a string to a number in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) parseInt()<br>b) parseFloat()<br>c) Number()<br>d) All of the above<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">48. Which built-in function is used to convert a number to a string in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) toString()<br>b) String()<br>c) toLocaleString()<br>d) All of the above<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">49. Which built-in function is used to align the decimal point in a number in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) toFixed()<br>b) toPrecision()<br>c) valueOf()<br>d) None of the above<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">50. What is a set in Typescript?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) A collection of unique values of any type<br>b) A collection of ordered elements of any type<br>c) A collection of related methods and properties<br>d) None of the above<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n","protected":false},"excerpt":{"rendered":"<p>1. What is Typescript? a) A scripting languageb) A superset of JavaScriptc) A programming languaged) A markup language Answer: b [&hellip;]<\/p>\n","protected":false},"author":33,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[1],"tags":[],"class_list":["post-10205","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Top 50 Type Script Interview Questions with Answers - scmGalaxy<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.scmgalaxy.com\/tutorials\/top-50-type-script-interview-questions-with-answers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Top 50 Type Script Interview Questions with Answers - scmGalaxy\" \/>\n<meta property=\"og:description\" content=\"1. 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