TypeScript Basics

1/25 What is the typing principle of typescript?
- Gradual
- Duck
- Dynamic
- All of the above
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 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.
5/25 What object oriented terms does Typescript support?
- Interfaces
- Classes
- Modules
- All of the above
6/25 Can alert() be used in TypeScript?
- Yes
- No
7/25 Which TypeScript feature allows for specifying types that cannot be extended or instantiated?
- Abstract Classes
- Interfaces
- Type Aliases
- Enumerations
8/25 Which TypeScript utility type constructs a type with all properties of a given type set to optional?
- Partial<T>
- Readonly<T>
- Required<T>
- Record<K, T>
9/25 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
10/25 In TypeScript, which access modifier makes members accessible only within their declaring class?
- Private
- Public
- Protected
- Internal
11/25 In TypeScript, which method decorator can be used to bind 'this' to the class instance?
- .bind()
- .apply()
- .call()
- .link()
12/25 Which TypeScript feature allows for better type inference by analyzing the flow of values in the code?
- Control Flow Analysis
- Type Guards
- Decorators
- Mapped Types
13/25 What is the result of compiling a TypeScript file with no type errors?
- JavaScript file with the same functionality
- TypeScript file with enhanced performance
- An executable binary file
- No output, as TypeScript is only for type checking
14/25 How can TypeScript enhance code maintainability compared to JavaScript?
- By enabling stronger typing
- By executing faster
- By reducing the number of lines of code
- By incorporating more libraries
15/25 What TypeScript feature is used for defining a variable that can have one of a set of named constants?
- Enum
- Union type
- Interface
- Tuple
16/25 Which TypeScript feature is primarily used for extending classes and interfaces?
- Generics
- Inheritance
- Modules
- Namespaces
17/25 How does TypeScript enhance debugging in comparison to plain JavaScript?
- By providing more detailed error messages during compile time
- By eliminating the need for debugging
- By automatically correcting syntax errors
- By increasing runtime performance
18/25 Which TypeScript feature is used to ensure function parameters match the expected type?
- Type assertions
- Type inference
- Type annotations
- Type guards
19/25 What does the 'any' type in TypeScript represent?
- A type that can only hold null values
- A type-safe way of declaring variables
- A type that can hold any kind of value
- A restricted type for function parameters
20/25 Which of the following is not a valid TypeScript data type?
- number
- boolean
- string
- character
21/25 Which of the following is true about TypeScript's compatibility with JavaScript?
- TypeScript is incompatible with JavaScript
- TypeScript can use JavaScript libraries
- JavaScript code must be rewritten to use in TypeScript
- TypeScript does not support JavaScript syntax
22/25 Which operator is used for type assertions in TypeScript?
- as
- is
- typeof
- instanceof
23/25 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
24/25 What is the TypeScript utility type used for constructing a type with a set of properties from another type?
- Partial
- Readonly
- Record
- Pick
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 What is the typing principle of typescript?

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 Which statements below are true about JSX modes?

5/25 What object oriented terms does Typescript support?

6/25 Can alert() be used in TypeScript?

7/25 Which TypeScript feature allows for specifying types that cannot be extended or instantiated?

8/25 Which TypeScript utility type constructs a type with all properties of a given type set to optional?

9/25 What is the TypeScript syntax for defining an enumeration?

10/25 In TypeScript, which access modifier makes members accessible only within their declaring class?

11/25 In TypeScript, which method decorator can be used to bind 'this' to the class instance?

12/25 Which TypeScript feature allows for better type inference by analyzing the flow of values in the code?

13/25 What is the result of compiling a TypeScript file with no type errors?

14/25 How can TypeScript enhance code maintainability compared to JavaScript?

15/25 What TypeScript feature is used for defining a variable that can have one of a set of named constants?

16/25 Which TypeScript feature is primarily used for extending classes and interfaces?

17/25 How does TypeScript enhance debugging in comparison to plain JavaScript?

18/25 Which TypeScript feature is used to ensure function parameters match the expected type?

19/25 What does the 'any' type in TypeScript represent?

20/25 Which of the following is not a valid TypeScript data type?

21/25 Which of the following is true about TypeScript's compatibility with JavaScript?

22/25 Which operator is used for type assertions in TypeScript?

23/25 What is the purpose of the 'never' type in TypeScript?

24/25 What is the TypeScript utility type used for constructing a type with a set of properties from another type?

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