What is the purpose of the break statement in a loop?

c) To terminate the loop immediately

b) To restart the loop from the beginning

How do you create an infinite loop in JavaScript?

d) for (let i = 0; i < Infinity; i++)

b) for (let i = 1; i < 10; i--)

c) for (let i = 0; i < 10; i++)

What is the purpose of the % (modulo) operator in a loop?

b) It calculates the remainder of a division operation.

a) It calculates the average of two numbers.

d) It rounds a number to the nearest integer.

Which of the following is an example of an infinite loop?

a) for (let i = 0; i < 5; i++) { }

c) for (let i = 1; i <= 10; i += 2) { }

d) for (let i = 10; i >= 0; i--) { }

What does the forEach method do in JavaScript?

b) Loops through the elements of an array.

a) Loops through the properties of an object.

c) Loops through the characters of a string.

d) Loops through the keys of a map.

How would you write a loop that prints even numbers from 2 to 10 (inclusive)?

a) for (let i = 2; i <= 10; i += 2) { }

b) for (let i = 2; i <= 10; i++) { }

c) for (let i = 1; i <= 10; i += 2) { }

d) for (let i = 1; i < 10; i += 2) { }

What is the purpose of the break statement in a loop?

a) To exit the loop and move to the next iteration.

b) To restart the loop from the beginning.

d) To pause the loop temporarily.

What is the key difference between a for loop and a while loop?

c) A for loop requires an initialization, a condition, and an increment/decrement, while a while loop only requires a condition.

a) A for loop can only loop through numbers, while a while loop can loop through any data type.

b) A for loop is more efficient for iterating through arrays, while a while loop is better for iterating through objects.

d) A for loop and a while loop are completely interchangeable and can be used in the same situations.

What is the purpose of the do...while loop?

b) To repeat a block of code while a condition is true.

c) To loop through the properties of an object.

d) To loop through the elements of an array.

What does the break statement do in a loop?

a) Terminates the loop and exits it entirely.

b) Skips the current iteration and moves to the next.

c) Repeats the current iteration.

d) Continues to the next iteration, ignoring any subsequent statements in the loop.

How would you write a loop that prints odd numbers from 1 to 9 (inclusive)?

b) for (let i = 1; i < 10; i += 2) { }

a) for (let i = 2; i <= 9; i += 2) { }

c) for (let i = 1; i <= 9; i++) { }

d) for (let i = 1; i <= 9; i += 2) { }

Which of the following statements is true about the initialization part of a for loop?

c) It initializes the loop control variable before the loop starts.

a) It defines the stopping condition for the loop.

b) It specifies the code block to be executed repeatedly.

d) It increments the loop control variable after each iteration.

How would you write a for loop that prints the squares of numbers from 1 to 5?

a) for (let i = 1; i <= 5; i++) { console.log(i * i); }

b) for (let i = 1; i <= 5; i++) { console.log(i + i); }

c) for (let i = 1; i <= 5; i++) { console.log(i); }

d) for (let i = 1; i <= 5; i++) { console.log(i * 2); }

Write a while loop that counts down from 10 to 1 and prints the numbers.

b) let i = 10; while (i >= 1) { console.log(i); i--; }

a) let i = 1; while (i <= 10) { console.log(i); i++; }

c) let i = 0; while (i < 10) { console.log(i); i++; }

d) let i = 10; while (i < 0) { console.log(i); i--; }

How would you use a for...of loop to iterate through an array and print its elements?

const array = [1, 2, 3, 4, 5]; for (const element of array) { console.log(element); }

const array = [1, 2, 3, 4, 5]; for (let i = 0; i < array.length; i++) { console.log(array[i]); }

const array = [1, 2, 3, 4, 5]; for (const i in array) { console.log(i); }

const array = [1, 2, 3, 4, 5]; for (const i = 0; i < array.length; i++) { console.log(element); }

Write a loop that calculates the factorial of a given positive integer n.

function factorial(n) { let result = 1; for (let i = 1; i <= n; i++) { result *= i; } return result; }

function factorial(n) { let result = n; for (let i = 1; i <= n; i++) { result *= i; } return result; }

function factorial(n) { let result = n; for (let i = n - 1; i > 0; i--) { result *= i; } return result; }

function factorial(n) { let result = 1; for (let i = n - 1; i > 0; i--) { result *= n; } return result; }

Use a for...in loop to iterate through an object and print its keys and values.

const person = { name: 'John', age: 30, occupation: 'developer' }; for (const key in person) { console.log(key + ': ' + person[key]); }

const person = { name: 'John', age: 30, occupation: 'developer' }; for (const key of Object.keys(person)) { console.log(key + ': ' + person[key]); }

const person = { name: 'John', age: 30, occupation: 'developer' }; for (const value of Object.values(person)) { console.log(value); }

const person = { name: 'John', age: 30, occupation: 'developer' }; for (const [key, value] of Object.entries(person)) { console.log(key + ': ' + value); }

Write a loop that finds the largest element in an array of numbers.

function findLargest(arr) { let largest = arr[0]; for (let i = 1; i < arr.length; i++) { if (arr[i] > largest) { largest = arr[i]; } } return largest; }

function findLargest(arr) { let largest = 0; for (let i = 0; i < arr.length; i++) { if (arr[i] > largest) { largest = arr[i]; } } return largest; }

function findLargest(arr) { let largest = arr[arr.length - 1]; for (let i = arr.length - 2; i >= 0; i--) { if (arr[i] > largest) { largest = arr[i]; } } return largest; }

function findLargest(arr) { let largest = arr[0]; for (let i = arr.length - 1; i > 0; i--) { if (arr[i] > largest) { largest = arr[i]; } } return largest; }

Javascript basics 8

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MULTIPLE CHOICE QUESTION

3 mins • 1 pt

What type of loop in JavaScript is used to execute a block of code a specific number of times?

while loop

for loop

if loop

do...while loop

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Which loop will always execute the code block at least once?

while loop

for loop

if loop

do...while loop

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

In a for loop, which part is optional?

a) Initialization

b) Condition

c) Increment/Decrement

d) All parts are required

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Which of the following is the correct syntax for a for loop in JavaScript?

a) for (var i = 0; i < 10; i++)

b) for (i = 0; i < 10; i++)

c) for (var i = 0; i < 10)

d) for i = 0; i < 10; i++

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

What is the purpose of the continue statement in a loop?

a) To terminate the loop immediately

b) To skip the current iteration and move to the next

c) To restart the loop from the beginning

d) To print a message to the console

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

How can an infinite loop be created using a for loop?

a) By providing an initial value

b) By not providing an exit condition

c) By using the break statement

d) By using the return statement

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

What is the output of the following code snippet?: for (let i = 0; i < 5; i++) { console.log(i); }

a) 0

b) 1

c) 0 1 2 3 4

d) 1 2 3 4

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Javascript basics 8

What type of loop in JavaScript is used to execute a block of code a specific number of times?

Which loop will always execute the code block at least once?

In a for loop, which part is optional?

Which of the following is the correct syntax for a for loop in JavaScript?

What is the purpose of the continue statement in a loop?

How can an infinite loop be created using a for loop?

What is the output of the following code snippet?: for (let i = 0; i < 5; i++) { console.log(i); }

Which loop is best suited when you want to loop through the elements of an array?

What is the purpose of the break statement in a loop?

What will be the value of i after the following code executes? let i = 0; do { i += 2; } while (i < 10);

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