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QUIZ TEST PRACTICE MCQS CHECK YOUR SKILL (credit GIAIC Student)

Click here For attempt quiz

Passcode giaicb1

EXAM PRACTICE (SLIDE/REPO) QUIZ & PRACTICE QUESTION

Quiz 1 Lecture 2 Variables and Data Types

Chatgpt Objective Quiz Link:
bit.ly/4cUfCP3
Code: TSQ

quiz prepared by babar shah
https://forms.gle/3LVbdANbLPkYcwV18

Final Exam MCQS/Practice

VOID MCQ
1. What is the purpose of the void type in TypeScript?

A) To represent a boolean value
B) To represent an absent or uninitialized value
C) To represent a numeric value
D) To represent a string value

Answer: B) To represent an absent or uninitialized value

1. Which of the following is a valid use of the void type?

A) let x: void = 5;
B) let x: void = null;
C) let x: void = undefined;
D) let x: void = 'hello';

Answer: C) let x: void = undefined;

1. What is the difference between void and undefined in TypeScript?

A) void is a type, while undefined is a value
B) void is a value, while undefined is a type
C) void and undefined are interchangeable
D) void is a subtype of undefined

Answer: A) void is a type, while undefined is a value

1. Can a function with a void return type return a value?

A) Yes, any value
B) Yes, but only undefined
C) No, it cannot return a value
D) It depends on the function implementation

Answer: B) Yes, but only undefined

1. What is the effect of assigning a value to a variable with a void type?

A) The value is ignored
B) The value is assigned, but a warning is given
C) A type error is thrown
D) The value is converted to undefined

Answer: C) A type error is thrown
1. What does the void keyword indicate when used as a function return type?

A) The function returns a boolean value
B) The function returns no value (or undefined)
C) The function returns a numeric value
D) The function returns a string value

Answer: B) The function returns no value (or undefined)

1. Which of the following functions correctly uses the void return type?

A) function foo(): void { return 'hello'; }
B) function foo(): void { console.log('hello'); }
C) function foo(): void { return 5; }
D) function foo(): void { return true; }

Answer: B) function foo(): void { console.log('hello'); }

1. What happens if a function with a void return type attempts to return a value?

A) The value is returned and ignored
B) A type error is thrown
C) The function returns undefined instead
D) The program crashes

Answer: B) A type error is thrown

structural typing:
1. What is the primary principle of structural typing?

A) Name-based compatibility
B) Shape-based compatibility
C) Type-based compatibility
D) Value-based compatibility

Answer: B) Shape-based compatibility

2. Which of the following is a key benefit of structural typing?

A) Improved code readability
B) Enhanced type safety
C) Increased flexibility and compatibility
D) Better support for object-oriented programming

Answer: C) Increased flexibility and compatibility

3. In structurally-typed languages, what determines whether two types are compatible?

A) The names of the types
B) The structure and shape of the types (e.g., properties, methods)
C) The inheritance hierarchy of the types
D) The values assigned to the types

Answer: B) The structure and shape of the types (e.g., properties, methods)

Use of arrays method shift unshift pop and push

MCQ 1:
What does the shift() method do to an array?

A) Removes the last element and returns it
B) Removes the first element and returns it
C) Adds a new element to the beginning of the array
D) Adds a new element to the end of the array

Answer: B) Removes the first element and returns it

MCQ 2:
What does the unshift() method do to an array?

A) Removes the first element and returns it
B) Removes the last element and returns it
C) Adds a new element to the beginning of the array
D) Adds a new element to the end of the array

Answer: C) Adds a new element to the beginning of the array

Here's a brief summary of each method:

- shift(): Removes the first element of the array and returns it.
- unshift(): Adds one or more elements to the beginning of the array.
- pop(): Removes the last element of the array and returns it.
- push(): Adds one or more elements to the end of the array.

difference between local and global variables, along with their uses:

MCQ 1:
What is the scope of a local variable?

A) Entire program
B) Specific function or block
C) Only within a loop
D) Only within a conditional statement

Answer: B) Specific function or block

MCQ 2:
What is the purpose of declaring a variable as global?

A) To limit its access to a specific function
B) To make it accessible throughout the program
C) To reduce memory usage
D) To improve performance

Answer: B) To make it accessible throughout the program

MCQ 3:
What happens when a local variable and a global variable have the same name?

A) The local variable hides the global variable
B) The global variable hides the local variable
C) Both variables become undefined
D) Both variables become null

Answer: A) The local variable hides the global variable

MCQ 4:
When should you use a global variable?

A) When the variable is used throughout the program
B) When the variable is used only within a specific function
C) When the variable is used only within a loop
D) When the variable is used only within a conditional statement

Answer: A) When the variable is used throughout the program

n try-catch blocks:

MCQ 1:
What is the purpose of the try block in a try-catch statement?

A) To handle runtime errors
B) To throw exceptions
C) To enclose code that might throw an exception
D) To skip over code that might throw an exception

Answer: C) To enclose code that might throw an exception

MCQ 2:
What happens when an exception is thrown in the try block?

A) The program terminates immediately
B) The catch block is executed
C) The finally block is executed
D) The exception is ignored

Answer: B) The catch block is executed

MCQ 3:
What is the purpose of the finally block in a try-catch statement?

A) To handle runtime errors
B) To throw exceptions
C) To execute code regardless of whether an exception was thrown
D) To skip over code that might throw an exception

Answer: C) To execute code regardless of whether an exception was thrown

MCQ 4
try {
console.log("Hello");
throw new Error("Error occurred");
} catch (error) {
console.log("Caught: " + error.message);
}

A) Hello
B) Caught: Error occurred
C) Hello Caught: Error occurred
D) Error: Error occurred

Answer: C) Hello Caught: Error occurred

Function
MCQ 1:
Which of the following is an example of a function declaration?

A) let add = (a, b) => a + b;
B) function add(a, b) { return a + b; }
C) const add = function(a, b) { return a + b; }
D) var add = function(a, b) { return a + b; }

Answer: B) function add(a, b) { return a + b; }

MCQ 2:
Which of the following is an example of an arrow function?

A) function add(a, b) { return a + b; }
B) let add = (a, b) => a + b;
C) const add = function(a, b) { return a + b; }
D) var add = function(a, b) { return a + b; }

Answer: B) let add = (a, b) => a + b;

MCQ 3:
Which of the following is an example of a function expression?

A) function add(a, b) { return a + b; }
B) let add = (a, b) => a + b;
C) const add = function(a, b) { return a + b; }
D) All of the above

Answer: D) All of the above (function expressions can take many forms)

MCQ 4:
Which of the following is an example of an immediately invoked function expression (IIFE)?

A) function add(a, b) { return a + b; }
B) let add = (a, b) => a + b;
C) (function(a, b) { return a + b; })(1, 2);
D) const add = function(a, b) { return a + b; }

Answer: C) (function(a, b) { return a + b; })(1, 2);

Module

MCQ 1:
What is the purpose of the export keyword in a module?

A) To import a module
B) To export a module or its parts
C) To declare a variable
D) To define a function

Answer: B) To export a module or its parts

MCQ 2:
What is the difference between export default and export?

A) export default exports a single value, while export exports multiple values
B) export default exports multiple values, while export exports a single value
C) export default is used for named modules, while export is used for default modules
D) export default is used for default modules, while export is used for named modules

Answer: D) export default is used for default modules, while export is used for named modules

MCQ 3:
How do you import a default module?

A) import { moduleName } from 'modulePath';
B) import moduleName from 'modulePath';
C) import * as moduleName from 'modulePath';
D) import moduleName = require('modulePath');

Answer: B) import moduleName from 'modulePath';

MCQ 4:
How do you import a named module?

A) import { namedExport } from 'modulePath';
B) import namedExport from 'modulePath';
C) import * as namedExport from 'modulePath';
D) import namedExport = require('modulePath');

Answer: A) import { namedExport } from 'modulePath';

Let me know if you want more questions or help with anything else!

1. What is the purpose of declaring a variable in programming?

• To store a value
• To print a message
• To perform a calculation
• To call a function
2. Which data type is used to store numbers in programming?*

• string
• boolean
• number
• float
3. What is the data type of the variable "name" in the following code: let name = "John"?

• string
• number
• void
4. Which variable declaration allows a value to be changed later in the code?
class
• let
• const
• static
5¬¬¬¬.What is the data type of the variable "age" in the following code: let age = 25?
• let
• const
• number
• string
6. const message: string = "Hello World";
message = false;

• cannot re-assigned
• false
• hello world
• 1234
7. How do you recognize the string?
• string always be written in quotations or backticks
• string always be written in curly brackets
• string always be written in parenthesis()
• string always be written in angular brackets <>


8. Which code is using type annotation?

• const myMessage = "Hello World";
• const myMessage: string = "Hello World";
• console.log("Hello World");
• All of these

9. What does the command tsc --init do? *

• Initializes a new Node.js project
• Compiles TypeScript code
• Installs TypeScript
• make tsc configure file
10. Which of the following is a correct way to write a multiple-line comment in TypeScript? *

• /* This is a comment */
•
• // This is a comment
• ''' This is a comment '''

Answer
1. To store a value

2. number (Note: float is not a separate data type in TypeScript, but rather a subset of the number type)

3. string

4. let (because let allows reassignment, unlike const which does not)

5. number

6. cannot re-assigned (because const values cannot be reassigned)

7. string always be written in quotations or backticks (strings can be defined using single quotes, double quotes, or backticks)

8. const myMessage: string = "Hello World"; (this code uses type annotation to specify the data type of the variable)

9. make tsc configure file (the command tsc --init creates a tsconfig.json file, which is used to configure the TypeScript compiler)

10. _/ This is a comment /_ (this is the correct way to write a multiple-line comment in TypeScript)

ADVANCE QUIZ
1
What is the type of the variable x in the following code: let x = 10?

A) string
B) number
C) boolean
D) any

Answer: B) number

2
Which of the following is a valid way to declare a variable in TypeScript?

A) var x = 10
B) let x = 10
C) const x = 10
D) All of the above

Answer: D) All of the above

3
What is the data type of the variable y in the following code: let y = 'hello'?

A) number
B) string
C) boolean
D) any

Answer: B) string

4
What is the purpose of the any data type in TypeScript?

A) To represent a boolean value
B) To represent a string value
C) To represent any data type
D) To represent a numeric value

Answer: C) To represent any data type

5
Which data type is used to represent a collection of values in TypeScript?

A) Array
B) Object
C) String
D) Number

Answer: A) Array

6
What is the type of the variable z in the following code: let z = true?

A) number
B) string
C) boolean
D) any

Answer: C) boolean

7
How do you declare a constant variable in TypeScript?

A) let x = 10
B) const x = 10
C) var x = 10
D) x = 10

Answer: B) const x = 10

8
What is the data type of the variable a in the following code: let a = [1, 2, 3]?

A) number
B) string
C) array
D) any

Answer: C) array

9
Can you assign a string value to a variable declared with the number type?

A) Yes
B) No

Answer: B) No

10
What is the purpose of the never data type in TypeScript?

A) To represent a value that never occurs
B) To represent a value that always occurs
C) To represent a string value
D) To represent a numeric value

Answer: A) To represent a value that never occurs

11
Which data type is used to represent a key-value collection in TypeScript?

A) Array
B) Object
C) String
D) Number

Answer: B) Object

12
Can you declare a variable without specifying its data type in TypeScript?

A) Yes
B) No

Answer: A) Yes (using the any type)

Arrays and its method MCQS IMPORTANT

What is the output of the following code?

Const arr = [1, 2, 3, 4, 5];
Const result = arr.reduce((acc,current) => acc + current,0);
Console.log(result);

A) 15
B) 20

C) 25
D) 30
Correct answer
A) 15
2
What is the output of following code?

Const arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ]
Const result = arr.filter(num => num % 2 === 0);
Console.log(result);

A) [1,3,5]
B) [1, 2, 3, 4, 5]
C) [2, 4, 6, 8, 10]
D) [2, 5, 6, 9, 4]

Correct answer
B) [2, 4, 6, 8, 10]

What is the output of following code?

Const arr = [1, 2, 3, 4, 5, 6, 7, 8, 9]
Const result = arr.slice(2,7);
Console.log(result);

A) [1,3,6]
B) [3,4,5,6,7]
C) [3,4,5,6]
D) [2,3,4,5,6]

Correct answer
C) [3,4,5,6,7]

What is the output of the following code?

Const arr = [1, 2, 3, 4, 5];
Const result = arr.filter(num => num % 2 === 0).map(num => num * 2).reduce((acc,current)=> acc + current, 0)

Console.log(result);


A) 20
B) 12
C) 30

D) 40
Correct answer
B) 12

What is the output of following code?

Const arr = [“a”,”b”,”c”];
Const result = arr.join(“ -!- “);
Const result1 = arr.join(“ =/= “);
Console.log(result);
Console.log(result1);


A) A,b,c

B) [a =/= b =/= c=/= ] 2 [a -!- b -!- c -!- ]
C) [a -!- b -!- c -!- ] [a =/= b =/= c=/= ]
D) [a , b , c ]
Correct answer
B) [a -!- b -!- c -!- ] [a =/= b =/= c=/= ]

What is the output of the following code:

Let arr = [1, 2, 3, 4, 5];
Console.log(arr.includes(6));




A) true
B) false
C) 0

C) -1
Correct answer
B) false

Which method is use to concatenate two or more array?


A) merge()
B) join()
C) concat()
D) push()

Correct answer
D) Concat()

What is the output of following code?

Const arr = [1,2,3,4,5]
Const result = arr.map(num => num * 2)
Console.log(result);


A) [1, 2, 3]
B) [2, 4, 6, 8, 10]
C) [2, 4, 6, 8]
D) [3, 4, 5]

Correct answer
B) [2, 4, 6, 8, 10]

What is the output of the following code:

Let arr = [1, 2, 3, 4, 5];
Arr.unshift(0, -1);
Arr.pop();
Console.log(arr);


//* A) [0, -1, 1, 2, 3, 4]
//* A) [-1, 0, 1, 2, 3, 4]
//* A) [0, -1, 1, 2, 3, 5]

//* A) [-1, 0, 1, 2, 4, 5]
Correct answer
//* A) [0, -1, 1, 2, 3, 4]

What is the output of following code?

Const arr1 = [1,2]
Const arr2 = [9,10]
Const result = arr1.concat(arr2)
Console.log(result);


A) [1, 9, 2, 10]
B) [1, 2, 3, 4]
C) [1, 2, 9, 10]
D) [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

Correct answer
C) [1, 2, 9, 10]

What is the output of following code?

Const arr1 = [1, 2]
Const arr2 = [3, 4]
Const result =arr1.concat(arr2).join(“ – “)
Console.log(result)

A) [1,2,3,4]

B) [1 – 2 – 3 – 4]
C) 1 – 2 – 3 – 4
D) [ “1 – 2 – 3 – 4”]
Correct answer
B) 1 – 2 – 3 – 4

Which element is used to transform each element of an array?


A) filter()
B) reduce()
C) map()
D) join()

Correct answer
C) Map()

Which is the output of the following code ?

Const names:string[] = [“a”,”b”,”c”,”d”,”e”,”c”,”e”,”f”,”c”]
Const ans1:boolean = names.includes(“c”,3,)
Const ans2:boolean = names.includes(“c”,7,)
Console.log(ans1);
Console.log(ans2);


A) false false
B) true true
C) false true

D) True false
Correct answer
B) true true

What is the output of the following code:

Let arr = [1, 2, 3, 4, 5];
Arr.push(6, 7);
Arr.shift();
Console.log(arr);


A) [2, 3, 4, 5, 6, 7]
B) [6, 7, 2, 3, 4, 5]
C) [1, 3, 4, 5, 6, 7]

E) [7, 2, 3, 4, 5, 6]
Correct answer
A) [2, 3, 4, 5, 6, 7]

What is the output of the following code:

Let arr = [1, 2, 3, 4, 5];
Arr.fill(0, 1, 3);
Console.log(arr);


A) [1, 0, 0, 0, 5]
B) [1, 0, 3, 4, 5]
C) [1, 0, 0, 4, 5]
D) [1, 2, 3, 4, 0]

Correct answer
B) [1, 0, 0, 4, 5]

What is the purpose of the fill() method in an array?


A) To add elements to the end of an array
B) To remove elements from an array
C) To fill an array with a specified value….
D) To sort an array

Correct answer
C) To fill an array with a specified value….

What is the output of the following code:

Let arr = [1, 2, 3, 4, 5];
Console.log(arr.includes(3));


A) true
B) false
C) 0

D) -1
Correct answer
A) True

What is the output of the following code:

Let arr = [1, 2, 3, 4, 5];
Arr.push(6, 7);
Arr.shift();
Arr.splice(2, 1);
Console.log(arr);


A) [2, 3, 5, 6, 7]
B) [2, 4, 5, 6, 7]
C) [2, 3, 6, 7]
D) [7, 2, 3, 5, 6]

Correct answer
A) [2, 3, 5, 6, 7]

What is the output of the following code:

Let arr = [1, 2, 3, 4, 5];
Arr.unshift(0, -1);
Arr.splice(2, 2);
Console.log(arr);


A) [-1, 0, 1, 4, 5]
B) [0, -1, 4, 5]
C) [0, -1, 1, 2, 5]
D) [0, -1, 3, 4, 5] right option


What is the output of the following code:

Let arr = [1, 2, 3, 4, 5];
Arr.slice(1, 3);
Console.log(arr);


A) [1, 2, 3, 4, 5]
B) [2, 3]
C) [1, 4, 5]
D) [1, 2, 4, 5]

Correct answer
B) [1, 4, 5]
1. What is the value of the variable "a"? Code


let a :number = 5;

a) 5

b) 33

c) "best"

d) undefined



Answer: a) 5



2. What is the benefit of using "let" instead of "var"?

a) Global scope

b) Blocked scope

c) Functional scope

d) None of the above



Answer: b) Blocked scope



3. Why does the code "console.log("let: " + z);" throw an error?

a) z is not defined in this scope

b) z is defined in this scope

c) z is a global variable

d) z is a constant



Answer: a) z is not defined in this scope



4. What is the purpose of the "import" statement in JavaScript?

a) To define a variable

b) To declare a function

c) To import a module or variable from another file

d) To export a variable



Answer: c) To import a module or variable from another file



5. What is the difference between "import a from "./first";" and "import {b, c} from "./second";)?

a) The first imports a default export, while the second imports named exports

b) The first imports named exports, while the second imports a default export

c) Both import default exports

d) Both import named exports



Answer: a) The first imports a default export, while the second imports named exports



6. What is the purpose of the "export" statement in JavaScript?

a) To import a module or variable from another file

b) To define a variable

c) To declare a function

d) To export a variable or module to another file



Answer: d) To export a variable or module to another file



7. What is the benefit of using ECMAScript modules?

a) They allow for global scope

b) They allow for blocked scope

c) They allow for easier import and export of modules and variables

d) They are not supported in modern browsers



Answer: c) They allow for easier import and export of modules and variables



8. What is the purpose of the "inquirer" module in JavaScript?

a) To prompt the user for input

b) To log output to the console

c) To import modules from other files

d) To export variables to other files



Answer: a) To prompt the user for input

NEW MCQS

1. What is the type of the variable "myname" in the code?
a) string
b) string | null
c) string | undefined
d) string | number

Answer: b) string | null

2. What is the value of "myname" after the code "myname = null;" is executed?
a) "zia"
b) null
c) undefined
d) 12

Answer: b) null

3. What happens when the code "myname = undefined;" is executed?
a) No error
b) Runtime error
c) Compile-time error
d) Syntax error

Answer: c) Compile-time error

4. What is the purpose of the "toString()" method in JavaScript?
a) To convert a value to a string
b) To convert a value to a number
c) To convert a value to a boolean
d) To convert a value to an object

Answer: a) To convert a value to a string

5. What is the type of the variable "myAge" in the code?
a) string
b) number
c) string | number
d) number | string

Answer: c) string | number

6. What is the value of "myAge" after the code "myAge = 16;" is executed?
a) "Dont Know"
b) 16
c) undefined
d) null

Answer: b) 16

7. What happens when the code "console.log(myAge.toLowerCase());" is executed?
a) No error
b) Runtime error
c) Compile-time error
d) Syntax error

Answer: c) Compile-time error

8. What is the purpose of the "toLowerCase()" method in JavaScript?
a) To convert a string to uppercase
b) To convert a string to lowercase
c) To convert a number to string
d) To convert a boolean to string

Answer: b) To convert a string to lowercase

9. What is the type of the variable "newAge" in the code?
a) string
b) number
c) string | number
d) number | string

Answer: c) string | number

10. What is the value of "newAge" after the code "let newAge = Math.random() > 0.6 ? "Khan" : 60;" is executed?
a) "Khan"
b) 60
c) undefined
d) null

Answer: a) "Khan" or b) 60

11. What happens when the code "newAge.toLowerCase();" is executed?
a) No error
b) Runtime error
c) Compile-time error
d) Syntax error

Answer: c) Compile-time error

12. What is the purpose of the "typeof" operator in JavaScript?
a) To check the type of a variable
b) To check the value of a variable
c) To check the scope of a variable
d) To check the hoisting of a variable

Answer: a) To check the type of a variable

13. What is the type of the variable "age" in the code?
a) number
b) string
c) number | string
d) number | "died" | "unknown"

Answer: d) number | "died" | "unknown"

14. What is the value of "age" after the code "age = 90;" is executed?
a) 90
b) "died"
c) "unknown"
d) "living"

Answer: a) 90

15. What happens when the code "age = "living";" is executed?
a) No error
b) Runtime error
c) Compile-time error
d) Syntax error

Answer: c) Compile-time error

16. What is the type of the variable "zia" in the code?
a) string
b) "zia"
c) "zia" | undefined
d) "zia" | null

Answer: b) "zia"

17. What happens when the code "zia = "khan";" is executed?
a) No error
b) Runtime error
c) Compile-time error
d) Syntax error

Answer: c) Compile-time error

18. What is the purpose of the "type alias" in TypeScript?
a) To create a new type
b) To create a new variable
c) To create a new function
d) To create a new class

Answer: a) To create a new type

Operators Quiz

1.What will message be?
• Let number = 11;
• Let message = number % 2 === 0 ? “Even” : “Odd”;
• Console.log(message);
2.What is the purpose of the else clause in an if-else statement?
• To execute code when the condition is true
• To call functions
• To declare variables
• To execute code when the condition is false

3.What does the following expression evaluate to?
Const result = (5 > 4) && (4 < 2);
• True
• False
• Undefine
• Null
4.What will the following expression return?
Const result = (undefined || ‘default’);
• False
• True
• Default
• Undefined
5.What is the purpose of the if statement in TypeScript?
• To loop through an array
• To make decisions based on conditions
• To declare variables
• To call functions

6.What will message be?

Let number = 13;

Let message = number % 2 === 0 ? “Even” : “Odd”;

Console.log(message);

• Even
• Odd
• 15
• Error
7.What is the purpose of the else clause in an if-else statement?
• To execute code when the condition is true
• To call functions
• To declare variables
• To execute code when the condition is false
8.What will be the output?

Let num = 10;

Let str = “10”;

If (num === str) {

Console.log(“Equal”);

} else {

Console.log(“Not Equal”);

}

• Equal
• Not Equal
• Error
• Undefined

9.What will the following code output?

Let isAvailable = false;

Console.log(!isAvailable);
• False
• Null
• Undefined
• True
10.What happens if the first operand of the && operator is false in TypeScript?
• It evaluates the second operand
• It skips evaluating the second operand
• It throws a runtime erro
• It depends on the tsconfig settings
11.What will be the output of the following TypeScript code?

Let a = 5;

Let b = 10;

Let result = (a > 0 && b++ > 5) && (a++ > 0);

Console.log(result: ${result}, a: ${a}, b: ${b});

• True, a:5, b:10
• False, a:6, b:11
• True, a: 6, b: 11
• False, a: 6, b: 11
12.What will be the output of the following TypeScript code snippet?

Let str: string = “hello”;

If (str === “HELLO”) {

Console.log(“Exact match”);

} else if (str.toLowerCase() === “hello”) {

Console.log(“Case-insensitive match”);

} else {

Console.log(“No match”);

}
• Hello
• Case-insensitive match
• No match
• HELLO
13. Given the following TypeScript code snippet, what will be the output?

Let x = 10;

Let y = 5;

If (x > 5 && y < 10) {

Console.log(“Condition is true”);

} else {

Console.log(“Condition is false”);

}
• Error
• Condition is true
• No output
• Condition is false
14. What will the following ternary operations evaluate to?

Const k = (5 > 3) ? ‘Yes’ : ‘No’;

Const l = (5 < 3) ? ‘Yes’ : (3 === 3) ? ‘Maybe’ : ‘No’;

Console.log(k, l);
• No Yes
• Yes Yes
• Yes Maybe
• Yes No
15. Given let x = true;

Let y = false;

What does (x && y) || (!x && !y) evaluate to?
• False
• Undefined
• Null
• True

16.Which logical operator would you use to check if a value is neither null nor undefined in TypeScript?
??
//
&&
!
Predict the output of the following code:

Const g = (true && false) || (false && true);

Const h = (true || false) && (false || true);

Console.log(g, h);
• False true
• True false
• True true
• False false
17. Let isAdmin: boolean = true;
Let isLoggedIn: boolean = false;
If (!isAdmin) {
Console.log(“You have access to admin privileges.”);
} else if (!isAdmin && isLoggedIn) {
Console.log(“You have access to regular user features.”);
} else {
Console.log(“You need to log in.”);
}
• You need to log in.
• You have access to admin privileges.
• You have access to regular user features.
• Other:

Function QUIZ/MCQS

Q1) Why do we use function in typescript?*
To enforce strict type checking
To create a class

To organize and reuse code
To declare a variable
Correct answer
To organize and reuse code

Q2) Tell me the output.
function myFunc(name: string = "babar"){
console.log(Hello ${name});
}
myFunc("Ahmed");

Hello Ahmed
Hello

Hello undefined
No output
Correct answer
Hello Ahmed

Q3) Mention the output.

function add(num1: number, num2?: number) {
if (!num2) {
return 10;
}
else{
return num1 + num2;
}
}
const myResult1 = add(5);
const myResult2 = add(8,4)
console.log(myResult1);
console.log(myResult2);

5, 12
12, 10

10, 12
5, 10
Correct answer
10, 12

Q4) Tell me the output.

const myFunc = () => {
return "Hello World"
}
myFunc()

undefined
Error

Hello World
No output
Correct answer
No output

Q5) How to introduce a 'default' parameter in typescript

By placing the parameter inside square brackets in the function declaration.

By using the default keyword before the parameter name in the function signature.
By providing a default value to the parameter in the function declaration.
By adding a question mark after the parameter name in the function declaration.
Correct answer
By providing a default value to the parameter in the function declaration.

Q6) Tell me the output.

function myFunc(data1: number, data2: number) {
let myValue: number = data1 + data2;
console.log(myValue * data2);
}
myFunc(5,10)

15
10

150
75
Correct answer
150

Q7) Which keyword is used to define a function in typescript?

func
class

def
function
Correct answer
function

Q8) Tell me the output

function myFunc(...data: string[]){
console.log(data[1]);
}
myFunc("Hello", "World")

Hello

Error
World
undefined
Correct answer
World

Q9) Which code is more accurate?*

const myFunc = (msg: string) => { return msg; }
const myFunc = (msg: string) => { msg }

const myFunc = (msg: string) => msg
const myFunc = (msg: string) => ( msg )
Correct answer
const myFunc = (msg: string) => msg

Q10) Why do we prefer arrow function over normal function?*

They offer more flexibility in defining optional parameter values
They provide stricter type checking and error handling

They offer more flexibility in defining default parameter values
They provide better performance due to their optimized syntax
Correct answer
They provide better performance due to their optimized syntax

Q11) Which one is the correct return type of the following function?

function myFunc(data1:number, data2: string){
const variable = data1 + data2;
return variable;
}
myFunc(10, "Hello");

number
void

string
none of these
Correct answer
string

Q12) Tell me the output.

function myFunc(data1?: string, data2?: string) {
if(data1){
return data2
}
if(data2){
return data1
}
}
const answer = myFunc("Hello")
console.log(answer);

Hello
No output
undefined

Error

Q13) What will be the output.

function firstPerson(): string{
return "My name is Salman";
}
function secondPerson(): string{
return "My name is Ahmed";
}
const message: string = 10 < 5 ? firstPerson() : secondPerson();
console.log(message);

My name is Ahmed
undefined
My name is Salman

Error
Correct answer
My name is Ahmed

Q14) Tell me the output.

function myFunc(data?:string){
return data;
}
const myAnswer = myFunc();
console.log(myAnswer);


Syntax Error
myAnswer

NaN
undefined
Correct answer
undefined

Q15) Mention the output.

function myFunc(value: boolean){
const myMessage: string = !value === false ? "Yes" : "No";
return myMessage;
}
const myAnswer1: string = myFunc(true);
const myAnswer2: string = myFunc(false);
console.log(myAnswer1);
console.log(myAnswer2);

Yes, Yes
Yes, No

No, Yes
No, No

Q16) Tell me the output.

function add(str1: string, str2: string): string{
return str2 + str1;
}
const myResult = add("Hello", "World ");
console.log(myResult);

Hello World
WorldHello
HelloWorld

World Hello
Correct answer
World Hello

Q17) What is the return type of the following function?
function myFunc(data1: string, data2: number){
console.log(data1 + data2);
}
myFunc("Hello", 10)

number
string

void
null
Correct answer
void

Q18) Mention the output of the following function

let myNum: number = 10;
function myFunc(myNum: number){
console.log(myNum);
myNum = 20;
console.log(myNum);
}
myFunc(5);
console.log(myNum);

10, 20, 5
5, 10, 20

5, 20, 10
5, 20, 20
Correct answer
5, 20, 10

Q19) How to introduce an 'optional' parameter in typescript


By adding a question mark after the parameter name in the function declaration.
By using the optional keyword before the parameter name in the function signature.

By placing the parameter inside square brackets in the function declaration.
By providing a default value to the parameter in the function declaration.
Correct answer
By adding a question mark after the parameter name in the function declaration.

Q20) Which type of function is described?

const myFunc = function(){
console.log("Hello World");
}
myFunc()

Named Function
Arrow Function

Anonymous function
Method function
Correct answer
Anonymous function

Project Code

CALCULATOR TYPESCRIPT CODE PROJECT 00

#! /usr/bin/env node k
import inquirer from "inquirer";
const answer = await inquirer.prompt([
{ message: "Enter your first number", type: "number", name: "firstNumber" },
{ message: "Enter your second number", type: "number", name: "secondNumber" },
{
message: "Select one of operators to perform action ",
type: "list",
name: "operator",
choices: ["ADDITION", "SUBTRACTION", "MULTIPLICATION", "DIVISION"],
},
]);
// CONDITIONAL STATEMENT
if (answer.operator === "ADDITION") {
console.log(answer.firstNumber + answer.secondNumber);
}
else if (answer.operator === "SUBTRACTION") {
console.log(answer.firstNumber - answer.secondNumber);
}
else if (answer.operator === "MULTIPLICATION") {
console.log(answer.firstNumber * answer.secondNumber);
}
else if (answer.operator === "DIVISION") {
console.log(answer.firstNumber / answer.secondNumber);
}
else {
"PLease select correct operator";
}