TypeScript - JavaScript's Superset MCQs Solution | TCS Fresco Play | Fresco Play

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1. var jarvis = function (x: number, y?: number): number {}  showcases

both

 2. var jarvis = function (x: number, y?: number): number {}  showcases ____________.

Both

3. _________ in the command line enables experimental support for decorators.

"tsc --target ES5 --experimentalDecorators"

4. __________ in command line enables experimental support for decorators.

experimentalDecorators: true*

5. __________ in command line enables experimental support for decorators.

experimentalDecorators: true

6. “any” is type of generic.

FALSE

7. A JavaScript file cannot be renamed to a TypeScript file

FALSE

8. A JavaScript file cannot be renamed to a TypeScript file

FALSE

9. A type system is a set of

Rules

10. Accessing a class of a module from outside is impossible in TypeScript.

FALSE

11. Accessing a class of a module from outside is impossible in TypeScript.

FALSE

12. Annotations can be implemented as length: 

number

13. At most, how many decorators can be applied to a declaration?

Multiple

14. Compiled .js of .ts containing class will also have class.

TRUE

15. Compiled .js of .ts containing class will also have class.

FALSE

16. Contextual typing in TypeScript is a form of ___________.

Type Inference

17. Contextual typing in TypeScript is a form of ___________.

Type Checking*

18. Decorators provide a way for

Both the options

19. Decorators provides a way for ________________.

Both

20. Decorators provides a way for ________________.

Annotation*

21. During compilation time, _______checking is done.

Static Type

To avoid assigning value for parameterized variable*

22. During compilation, TypeScript code gets converted to assembly language.

FALSE

23. During run time, __checking is done

Dynamic Type

24. Dynamic type checking is done at __________.

Run time

25. Enum organises _______________.

Set of related values

26. Enum organises _______________.

Set of related values

27. Enum organizes a

SET OF RELATED VALUES

28. Generics allows to accept arguments of __________.

Different types

29. Generics allows to accept arguments of __________.

Different types

30. Generics allows to accept arguments of__

Different types

31. Generics are _______

Template

32. How can we access a class from a module from outside?

By using "module"*

33. How can we access a class of module from outside?

By using "implements"*,

34. Inheritance is implemented by using which keyword?

extends

35. Likewise other elements, Interface of TypeScript is usually converted to JavaScript.

TRUE

36. Static type checking is done at

Compilation time

37. Syntax for a decorator is

@symbol

38. The code snippet " if (value && typeof value == "string") {}; is used for 39. ______________.

Overloading

39. The code snippet " if (value && typeof value == "string") {}; is used for ______________.

Overloading

40. The following are correct ways of defining variables in TypeScript, 

except _

41. The optional parameter can be defined by using

TRUE

42. The value of TypeScript is writing

Safer code

43. To a declaration, at most how many decorators can be applied?

Only one per declaration*

44. To a declaration, at most how many decorators can be applied?

Only one per declaration

45. Type Annotations allows us to

Record the intended contract of the function or variable.

46. Type Annotations allows us to

Record the intended contract of the function or variable.

47. Type System is a _____________.

Set of rules

48. TypeScript allows us access to private members via ___________.

get and set

49. TypeScript allows us access to private members via ___________.

get and set

50. Typescript compiler tsc converts code to

JavaScript

51. TypeScript is

Object Oriented

52. TypeScript is a open source programming language.

FALSE

53. TypeScript is a__

Super-set of JavaScript

54. TypeScript uses prototypical inheritance instead of classical inheritance.

FALSE

55. TypeScript was made public by

Microsoft

56. value && typeof value == "DataType" is used for

Overloading

57. We can rename a .js file to .ts file generally

TRUE

58. What is the form associated with @expression?

Decorators

59. What is the form associated with @expression?

Decorators

60. What is true about Mixins in TypeScript?

All of these

61. What is true about Mixins in TypeScript?

All of these

62. What type of checking does Java programming language use?

Static type checking

63. Which is not a type that TypeScript supports?

integer

64. Which is not a type that TypeScript supports?

integer

65. Which keyword is used for Inheritance in TypeScript?

extends

66. Which keyword is used for Inheritance in TypeScript?

extends

67. Which key work is used to access base class properties?

super

68. Which of the following are inherited from base class?

all of these

69. Which of the following demonstrates function overloading, if possible, in TypeScript?

if (value && typeof value == "number"){}

70. Which of the following demonstrates function overloading, if possible, in TypeScript?

if (value && typeof value == "number"){}

71. Which of the following is a wrong way to declare the variable in TypeScript?

var 2

72. Which of the following is the right way of defining enum?

all of these

73. Which of the following is the right way of defining enum?

all of these

74. Which of the following is the wrong way of defining variables in TypeScript

var 10231

75. Which of the following is the wrong way of defining variables in TypeScript?

var 10231

76. Which of the two is used appropriately in JavaScript code:

function reverse(s: string) : string;

77. Which one of the following code snippet is safer?

function fn(x: () => void) { x(); }

78. Which type is assigned to variables with null type

None of these

79. Which type is assigned to variables with null type?

None of these+

80. Why optional parameters are added?

To avoid assigning value for parameterized variable

81. Why optional parameters are added?

To assure that value is always assigned to the variable*,