JavaScript Basics

What are Primitive and Reference variables in JavaScript?
What is undefined in JavaScript?
What is null in JavaScript?
How to check if a variable is undefined or null in JavaScript?
How to check if a variable is a string in JavaScript?
How to check if a variable is an array in JavaScript?
How to check if a variable is an object or not in JavaScript?
How to use boolean data type in JavaScript?
How to use Logical OR (||) operator in JavaScript?
How to use Logical AND (&&) operator in JavaScript?
How to use Logical operators in JavaScript?
What is the difference between && and || in JavaScript?

JavaScript Advanced

JavaScript Rest Operator
How to use spread operator in JavaScript?
What is the difference between spread and rest operator in JavaScript?
How to spread an object in JavaScript?
What are template literals in JavaScript?
What is ${} in JavaScript?
What is String Interpolation in JavaScript?
What is Array Destructuring in JavaScript?
What is Object Destructuring in JavaScript and How to use it?
How to use object destructuring as function parameters in JavaScript?
JavaScript Object Destructuring Exercises, Practice and Solution
How to use ES6 for...of loop in JavaScript?
How to use for...of loop to iterate over an object in JavaScript?
How to export modules in JavaScript?
How to use export default in JavaScript?

JavaScript Arrays

What is an array in JavaScript?
How to access array elements in JavaScript?
How to find Array length in JavaScript?
How to convert array to string in JavaScript?
What is Array push() method in JavaScript?
How to use Array pop() method in JavaScript?
How to use Array shift() method in JavaScript?
How to use Array unshift() method in JavaScript?
How to use forEach() method to loop through JavaScript Array?
How to use the JavaScript Array map() method?
How to use the Array filter() method in JavaScript?
What is the array reduce() method in JavaScript?
How to reduce an array of objects in JavaScript?
How to use the Array concat() method in JavaScript?
How to reverse an array in JavaScript?
How to check if all values in array are true in JavaScript?
How to check if all values in array are false in JavaScript?
How to check if all values in array are null in JavaScript?
JavaScript Array Exercises, Practice and Solution

JavaScript Functions

How to return multiple values from a function in JavaScript?
How to use Default Parameters in JavaScript Function?
Pass by value in JavaScript
Pass by reference in JavaScript
How to use arguments object in JavaScript Function?
How to write JavaScript function that accepts variable number of arguments?
JavaScript Arrow Function Exercises and Practice Questions

JavaScript Objects

How to copy objects in JavaScript?
How to check if a property exists in a JavaScript object?

JavaScript DOM

How to select an HTML element by Id in JavaScript?
How to select HTML elements by Tag Name in JavaScript?
How to select HTML elements by Class Name in JavaScript?
How to select HTML form elements by Name in JavaScript?
How to select HTML elements by CSS Selectors in JavaScript?
How to get the parent element in JavaScript?
How to get the first child of an element in JavaScript?
How to get the last child of an element in JavaScript?
How to get the attribute value of an element in JavaScript?
How to set the value of an attribute in JavaScript?
How to remove an attribute from an element in JavaScript?
How to check if an attribute exists in JavaScript?

JavaScript String

JavaScript String Concatenation
JavaScript String Equality
Length of a string in JavaScript
JavaScript convert string to lowercase
JavaScript convert string to uppercase
How to remove whitespaces from a string in JavaScript?
How to remove whitespaces from the beginning of a string in JavaScript?
How to remove whitespaces from the end of a string in JavaScript?
How to use the String trimStart() method in JavaScript?
How to use the String trimEnd() method in JavaScript?
JavaScript String slice() method
JavaScript String substring() method
JavaScript String split() method

JavaScript Exercises, Practice Problems, and Solution

One of the best ways to learn a programming language is to solve practice problems and exercises. This page has examples and exercises on various concepts of JavaScript. It is advised that you try to solve these examples on your own and then check the provided solution.

How to add two numbers in JavaScript?
How to add two numbers using textbox in JavaScript?
How to swap two numbers without using third variable in JavaScript?
How to swap two numbers using JavaScript?
JavaScript program for calculating the square root of a number
How to calculate the area of a triangle in JavaScript?
JavaScript program to calculate the area of a circle
How to find the area and perimeter of a rectangle in JavaScript?
JavaScript program to list the properties of a JavaScript object
How to convert string to float in JavaScript?
How to convert a string to a number in JavaScript?
How to add commas to a number in JavaScript?
How to format number as currency string using JavaScript?
How to format float to 2 decimal places in JavaScript?
How to convert Celsius to Fahrenheit using JavaScript?
JavaScript program to convert Fahrenheit to Celsius
How to create a temperature converter in HTML and JavaScript?
How to check if a number is positive or negative in JavaScript?
JavaScript program to check if a number is zero
How to check if a number is odd or even in JavaScript?
Prime number program in JavaScript
JavaScript program to print all prime numbers from 1 to 100
Sum of prime numbers from 1 to 100 in JavaScript
Print prime numbers between two numbers in JavaScript
How to convert Kilometers to Miles using JavaScript?
How to generate a random number in JavaScript?
How to get the decimal part of a number in JavaScript?
How to get the value before the decimal point in JavaScript?
How to get the number of digits before the decimal in JavaScript?
How to remove the digits after the decimal in JavaScript?
How to count the number of digits in a string using JavaScript?