Which of the following options correctly declares a function named multiply that takes two parameters and returns their product?

function multiply(a, { return a * b; }

function multiply(a, { return a + b; }

function multiply(a, { a * b; }

What is the purpose of the switch statement in JS?

It allows you to choose between different actions based on different conditions.

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

let i = 2; while (i < 10) { console.log(i); i += 2; }

let i = 2; while (i <= 10) { console.log(i); i++; }

let i = 1; while (i <= 10) { console.log(i); i += 2; }

let i = 1; while (i <= 10) { if (i % 2 === 0) { console.log(i); } i++; }

Which of the following correctly defines an arrow function that calculates the cube of a number n?

const cube = n => { n * n * n; }

What is the purpose of the NaN value in JS?

It stands for "not a number" and indicates an unrepresentable value resulting from an invalid calculation.

It represents the value "not null".

It is used to declare undefined variables.

It is a string representing "no value".

Which of the following is a correct way to create an object with properties name and age?

const person = { name: 'John', age: 30; }

const person = [name: 'John', age: 30];

const person = (name: 'John', age: 30);

Which statement is used to iterate over the elements of an array?

for (let i = 0; i < array.length; i++) { }

for each (element in JS?rray) { }

foreach (let element of array) { }

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

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

let i = 2; do { console.log(i); i += 2; } while (i <= 10);

let i = 0; do { console.log(i); i += 2; } while (i < 10);

let i = 1; do { if (i % 2 !== 0) { console.log(i); } i++; } while (i < 10);

Which of the following correctly defines an arrow function that calculates the sum of two numbers a and b?

const sum = (a, => { return a + b; }

const sum = (a, => return a + b;

What is the purpose of the null value in JS?

It stands for "no value" or "absence of a value".

It represents the value "not a number".

It is used to define empty strings.

It is a placeholder for undefined variables.

Javascript basics 6 Quiz: 29 Practice Questions

29 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What will be the result of the following code? console.log(3 + '5');

8

35

53

15

2.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

How can you check if a variable x is of type "string"?

typeof(x) === 'string'

x.type === 'string'

x instanceof String

x.typeOf(String)

3.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the purpose of the === operator in JS?

It performs type coercion.

It assigns a value to a variable.

It checks for equality without type conversion.

It concatenates two strings.

4.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which of the following is not a valid way to declare a variable in JS?

let x = 5;

const y = 10;

var z = 15;

variable w = 20;

5.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What will the following code snippet print to the console?const numbers = [1, 2, 3, 4, 5]; numbers.forEach(function(num) { console.log(num * 2); });

1 2 3 4 5

2 4 6 8 10

1 4 9 16 25

2 3 4 5 6

6.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the output of the following code snippet? let a = 10; if (a > 5) { console.log('Hello'); } else { console.log('World'); }

Hello

World

Hello World

No output

7.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

How do you write an if statement that checks if a number x is positive?

if (x >= 0) { }

if (x > 0) { }

if (x < 0) { }

if (x == 0) { }

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Javascript basics 6

What will be the result of the following code? console.log(3 + '5');

How can you check if a variable x is of type "string"?

What is the purpose of the === operator in JS?

Which of the following is not a valid way to declare a variable in JS?

What will the following code snippet print to the console?const numbers = [1, 2, 3, 4, 5]; numbers.forEach(function(num) { console.log(num * 2); });

What is the output of the following code snippet? let a = 10; if (a > 5) { console.log('Hello'); } else { console.log('World'); }

How do you write an if statement that checks if a number x is positive?

Which of the following options correctly declares a function named multiply that takes two parameters and returns their product?

What is the purpose of the switch statement in JS?

Which loop construct is ideal when you want to loop through the properties of an object?

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