TypeScript Basics

1/25 All are backported features of TypeScript, except….
- Arrows
- Classes
- Modules
- Methods
2/25 Which of the statements below is true about the variables in Typescript?
- A variable name should include both alphabets and numeric digits.
- A variable name cannot start with a digit.
- It cannot include spaces and special characters except for dollar ($) sign and underscore (_).
- All of the above.
3/25 A typescript may be installed or managed through…
- Tag
- Nmp
- Space
- Void
4/25 The different Data Types supported by Typescript are...
- Boolean let bValue: boolean = false;
- String let name: string = "Jack";
- Number let age: number = 16;
- All of the above
5/25 Which statements below are true about JSX modes?
- The preserve mode keeps the JSX as part of the output to be further consumed by another transform step.
- The react mode will emit React.addElement.
- The preserve, react, and react native modes don’t affect the emit stage - type checking is affected.
- The output of react mode has a .jsx file extension.
6/25 What object oriented terms does Typescript support?
- Interfaces
- Classes
- Modules
- All of the above
7/25 The TypeScript components are....
- TypeScript Compiler
- TypeScript Language Service
- TypeScript Language
- All of the above
8/25 What are considered the types of access modifiers supported by TypeScript?
- Public
- Private
- Protected
- All of the above
9/25 What will be output of the following expression?
```
let a:string=47; 

     console.log( " Value of a= " +a);
```
- Value of a=47
- Value of a=0
- Value of a=
- None of the above
10/25 Can alert() be used in TypeScript?
- Yes
- No
11/25 What is the TypeScript syntax for defining an enumeration?
```
enum Direction { Up, Down, Left, Right }
```
- Correct as is
- enum Direction = { Up, Down, Left, Right }
- enum Direction [ Up, Down, Left, Right ]
- enum { Up, Down, Left, Right } as Direction
12/25 In TypeScript, which access modifier makes members accessible only within their declaring class?
- Private
- Public
- Protected
- Internal
13/25 What TypeScript feature is used to add static type checking to JavaScript arrays?
- Generic Types
- Union Types
- Tuple Types
- Any Type
14/25 In TypeScript, which method decorator can be used to bind 'this' to the class instance?
- .bind()
- .apply()
- .call()
- .link()
15/25 In TypeScript, which keyword is used to declare a constant variable?
- let
- var
- const
- static
16/25 What TypeScript utility type makes all properties of an object optional?
- Partial
- Readonly
- Record
- Required
17/25 Which TypeScript feature is used to ensure function parameters match the expected type?
- Type assertions
- Type inference
- Type annotations
- Type guards
18/25 In TypeScript, what is a Tuple?
- A type of function
- An array with fixed number of elements
- A JSON object
- A method for type casting
19/25 What TypeScript feature allows for specifying an array of multiple data types?
- Union Types
- Generics
- Enum
- Any
- Tuple
20/25 Which operator is used for type assertions in TypeScript?
- as
- is
- typeof
- instanceof
21/25 What is the purpose of the 'never' type in TypeScript?
- To represent any type of value
- To represent values that never occur
- To declare a variable without a type
- To define optional parameters
22/25 In TypeScript, which access modifier makes a member visible only within its containing class?
- Public
- Private
- Protected
- Static
23/25 Which TypeScript feature allows you to work with variables of unknown types in a safe way?
- Any type
- Unknown type
- Void type
- Never type
24/25 How do you declare a readonly array in TypeScript?
- const[]
- readonly[]
- immutable[]
- fixed[]
25/25 What TypeScript feature allows you to conditionally select a type?
- Union types
- Conditional types
- Intersection types
- Mapped types
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TypeScript Basics

1/25 All are backported features of TypeScript, except….

2/25 Which of the statements below is true about the variables in Typescript?

3/25 A typescript may be installed or managed through…

4/25 The different Data Types supported by Typescript are...

5/25 Which statements below are true about JSX modes?

6/25 What object oriented terms does Typescript support?

7/25 The TypeScript components are....

8/25 What are considered the types of access modifiers supported by TypeScript?

9/25 What will be output of the following expression?

10/25 Can alert() be used in TypeScript?

11/25 What is the TypeScript syntax for defining an enumeration?

12/25 In TypeScript, which access modifier makes members accessible only within their declaring class?

13/25 What TypeScript feature is used to add static type checking to JavaScript arrays?

14/25 In TypeScript, which method decorator can be used to bind 'this' to the class instance?

15/25 In TypeScript, which keyword is used to declare a constant variable?

16/25 What TypeScript utility type makes all properties of an object optional?

17/25 Which TypeScript feature is used to ensure function parameters match the expected type?

18/25 In TypeScript, what is a Tuple?

19/25 What TypeScript feature allows for specifying an array of multiple data types?

20/25 Which operator is used for type assertions in TypeScript?

21/25 What is the purpose of the 'never' type in TypeScript?

22/25 In TypeScript, which access modifier makes a member visible only within its containing class?

23/25 Which TypeScript feature allows you to work with variables of unknown types in a safe way?

24/25 How do you declare a readonly array in TypeScript?

25/25 What TypeScript feature allows you to conditionally select a type?