In this tutorial, we will learn how to compare arrays in JavaScript using various methods. We will check whether each element present in one array is equal to the counterpart of the other array or not. If both the arrays are the same, then we will return true. Else, we ... Read More

In this tutorial, we will learn to check whether a value is a safe integer or not in JavaScript. The simple definition of the safe integer in JavaScript is all numbers we can represent under the IEEE-754 double-precision number. It is the set of all numbers which lie between the ... Read More

In this tutorial, we will learn to check if the variable is a Boolean in JavaScript. In JavaScript, if we match the two different variables with the same value and different data types using the equality operator, it returns a true value. It means if we compare a twovariable with ... Read More

In this tutorial, we will learn to check if the variable is NaN in JavaScript. The full form of the NaN is ‘not a number’. The NaN is the reserved keyword in the JavaScript which we can assign to the variable. If users are using the below method to check ... Read More

In this tutorial, we will learn to check if a variable is an integer in JavaScript. Before we solve the problem, we must have a problem. We can ask ourselves, “why do we need to check if the variable is an integer?”. Let’s understand the answer using a single example. ... Read More

In this tutorial, we will learn to check whether the JavaScript function is defined or not. If a programmer calls the JavaScript function without defining it, they will see the reference error with the message like “function is not defined.” To overcome the problem, the programmer can check whether the ... Read More

In this tutorial, we will learn to check for null, undefined, or blank variables in JavaScript. There is no particular built-in library function to check whether a variable is undefined or null. Still, we can use some operators such as typeof operator and equality operator to check the variable. Before ... Read More

In this tutorial, we will learn to change the value of an attribute in JavaScript. To build web applications, the most programmer uses three languages. HTML, CSS, and JavaScript. The HTML is used to create the base for the web page, CSS for styling, and JavaScript adds the dynamic behaviours ... Read More

In this tutorial, programmers will learn to change the font size of the text using JavaScript. Many application allows users to change the font size according to users’ requirement. We need to change the default font size using JavaScript to achieve that. Before we move ahead with the tutorial, let’s ... Read More

In this tutorial, we will learn to center the JavaScript alert box. In JavaScript, an alert box is useful to show users some message, information, warning, success, etc. Let’s understand it by real-world example when you open any website on the web browser and start to authenticate by entering your ... Read More