TypeScript Basics

1/25 Which of the following filenames is the extension for typescript?
- .tt
- .nod
- .ts
- .txt
2/25 Which of the options below power the interactive TypeScript experience in Visual Studio, Vs Code, Sublime, the TypeScript playground and other editor.
- TypeScript main
- TypeScript language
- TypeScript compiler
- TypeScript method
3/25 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.
4/25 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
5/25 Can alert() be used in TypeScript?
- Yes
- No
6/25 Which TypeScript feature allows for specifying types that cannot be extended or instantiated?
- Abstract Classes
- Interfaces
- Type Aliases
- Enumerations
7/25 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>
8/25 What TypeScript feature is used to add static type checking to JavaScript arrays?
- Generic Types
- Union Types
- Tuple Types
- Any Type
9/25 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
10/25 How does TypeScript handle null and undefined by default in strict mode?
- They are considered the same as empty string
- They are ignored
- They are treated as separate types
- They cause a compilation error
11/25 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
12/25 Which TypeScript feature allows for specifying an exact set of string values a variable can hold?
- Generics
- Enums
- String Literal Types
- Interfaces
13/25 What TypeScript utility type makes all properties of an object optional?
- Partial
- Readonly
- Record
- Required
14/25 Which is not a valid way to declare a variable in TypeScript?
- let
- const
- var
- def
15/25 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
16/25 In TypeScript, how do you annotate a variable of a custom type?
- Using the 'type' keyword
- By specifying the type after the variable name
- Using the 'var' keyword
- Type annotation is not supported
17/25 What TypeScript feature allows for specifying an array of multiple data types?
- Union Types
- Generics
- Enum
- Any
- Tuple
18/25 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
19/25 In TypeScript, which of the following is a correct way to define an enum?
- enum Direction { Up, Down, Left, Right }
- enum Direction = { Up, Down, Left, Right }
- Direction = ['Up', 'Down', 'Left', 'Right']
- enum Direction ( Up, Down, Left, Right )
20/25 What TypeScript feature allows for custom type checks at compile time?
- Type Guards
- Interfaces
- Decorators
- Mixins
21/25 What TypeScript feature allows for specifying an array where order and type of elements are fixed?
- Enums
- Tuples
- Generics
- Interfaces
22/25 In TypeScript, which access modifier makes a member visible only within its containing class?
- Public
- Private
- Protected
- Static
23/25 What is the TypeScript utility type used for constructing a type with a set of properties from another type?
- Partial
- Readonly
- Record
- Pick
24/25 Which TypeScript feature allows you to work with variables of unknown types in a safe way?
- Any type
- Unknown type
- Void type
- Never type
25/25 Which TypeScript feature is used to describe the shape of an object?
- Type alias
- Interface
- Class
- Function
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TypeScript Basics

1/25 Which of the following filenames is the extension for typescript?

2/25 Which of the options below power the interactive TypeScript experience in Visual Studio, Vs Code, Sublime, the TypeScript playground and other editor.

3/25 Which of the statements below is true about the variables in Typescript?

4/25 What will be output of the following expression?

5/25 Can alert() be used in TypeScript?

6/25 Which TypeScript feature allows for specifying types that cannot be extended or instantiated?

7/25 Which TypeScript utility type constructs a type with all properties of a given type set to optional?

8/25 What TypeScript feature is used to add static type checking to JavaScript arrays?

9/25 What is the result of compiling a TypeScript file with no type errors?

10/25 How does TypeScript handle null and undefined by default in strict mode?

11/25 How can TypeScript enhance code maintainability compared to JavaScript?

12/25 Which TypeScript feature allows for specifying an exact set of string values a variable can hold?

13/25 What TypeScript utility type makes all properties of an object optional?

14/25 Which is not a valid way to declare a variable in TypeScript?

15/25 In TypeScript, what is a Tuple?

16/25 In TypeScript, how do you annotate a variable of a custom type?

17/25 What TypeScript feature allows for specifying an array of multiple data types?

18/25 What is the purpose of the 'never' type in TypeScript?

19/25 In TypeScript, which of the following is a correct way to define an enum?

20/25 What TypeScript feature allows for custom type checks at compile time?

21/25 What TypeScript feature allows for specifying an array where order and type of elements are fixed?

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

23/25 What is the TypeScript utility type used for constructing a type with a set of properties from another type?

24/25 Which TypeScript feature allows you to work with variables of unknown types in a safe way?

25/25 Which TypeScript feature is used to describe the shape of an object?