In this tutorial, we will check if two numbers are approximately equal or not. In case given two numbers are equal then we will print yes, it is otherwise not it’s not.But let me make you clear that we are not going to do any magic here, basically we will also have to give an epsilon value.So, when we calculate the absolute difference between those two numbers and then compare with the epsilon then if absolute difference is lesser than the epsilon then the numbers are approximately equal else not approximately equal.Suppose two numbers given is 6.79 and 6.75 and ... Read More

concat() method The fundamental operation for combining two strings is concatenation. String combining is a necessary part of programming. We need to first clear out the fundamentals before we can discuss "String Concatenation in JavaScript." A new string is produced when an interpreter performs the operation. In order to create a new string, the concat() method joins the calling string and the string arguments. The initial string and the string that was returned are unaffected by changes to either. When concatenating, string values are first transformed from parameters that are not of the type string. Syntax Following is the syntax ... Read More

In this article, we will check whether the constructor of an object is a JavaScript Object. The constructor property of any JavaScript variable returns a reference to the Object constructor function that created the instance object. The value of this property is a reference to the function itself.All the objects have the constructor property and the objects created without the constructor function will have a constructor property that points to the Fundamental Object constructor type for that object.To check whether the constructor of provided value is an Object created by the object constructor function or not we need to compare the value ... Read More

In this tutorial, we will check if the bottom part of a page is visible or not to the user. We can do this functionality by using the height of the window and the height of the scrolled window. To write this code we need to understand three methods of JavaScript which are given asscrollY − It is the read-only property of the window, and returns the pixels a document has scrolled vertically.window.scrollYscrollHeight −It is an HTML DOM element and a read-only property of the window. It returns the height of an element’s content including the content that is not ... Read More

In this article, we are going to understand how we can pause and play a loop whenever we want using event listeners and promises in JavaScript. Pause and play to a loop refers to as a for loop is running and we want to make a pause in between any position in a loop or want to play it again.An event listener can be attached to any element to control how the event reacts to bubbling. It attaches an event handler to an element.SyntaxFollowing is the syntax of an event listener −element.addEventListener(event, function, useCapture);Parametersevent − it is the name of ... Read More

In this article, we will check whether a number lies between a range or not and display a message according to the output we get. This feature of JavaScript allows you to put a number validation while creating a form or any other document.SyntaxFollowing is the syntax to check if number is in range and display the message −if (isNaN(number) || number < lower || number > upper){    document.getElementById("output").innerHTML = number + " is not in range"; } else {    document.getElementById("output").innerHTML = number + " is in range"; }Here number is the input number to check if it ... Read More

Dynamic values are the values we assign to the dynamic variables. A dynamic variable is a type of variable that doesn't have any specific name in the code through hard coded, its address is determined when the code is running. The name dynamic refers to the value which is capable of action and change.Here we will see how we can create the dynamic values in JavaScript which are also part of object values and change the dynamic variable name in the future without accessing the group. It refers to that we declare a variable and further on we use the ... Read More

An integer is known to be a safe integer if that can be exactly represented as an IEEE-754 double precision number. A safe integer is an integer in the range -(2^53 - 1) to (2^53 - 1). All these numbers are considered safe integer because it allows the one-to-one mapping of the numbers between the mathematical integers and their representation in JavaScript.SyntaxFollowing the syntax to check for a safe integer −Number.isSafeInteger(testValue)Here testValue is the number to check if it is a safe integer or not.It will return true if testValue is a safe integer else false.Example Check If a Number is a ... Read More

A runtime environment is an environment where your code will be executed. It tells what global objects your code can access and it also impacts its result. A JavaScript code can run in different types of environments some of them are Node.js, Service Workers, or in a web browser. So, to start coding in JavaScript, you don’t have to install any additional software. Each web browser comes with a JavaScript engine. You can simply run scripts you write inside any browser but it ensures that it follows all the rules of the ECMAScript (ES6) functionality.Here we will detect in which ... Read More

In this article, we will learn how to add colors to the text and print them in the console window of JavaScript. In the original, all the data printed in the console is of black color no other color is reflected in the console but here we are going to add some special characters with text to make our console window look more colorful.There are some special codes that help change in color of the output in the console window and these codes are known as ANSI escape codes. By adding these codes in the console.log() method we can see ... Read More