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Javascript Articles
Page 38 of 534
How to change an element's class with JavaScript?
In JavaScript, you can change an element's class using several methods. The most common approaches are using the className property for complete replacement and classList methods for more flexible manipulation. How to change the element's class using className property How to toggle between classes using className and classList Using className Property The className property allows you to get or set the entire class attribute of an element. When you assign a new value, it replaces all existing classes. Example ...
Read MoreWhat is Unary Plus Operator in JavaScript?
The unary plus operator (+) is a JavaScript operator that converts its operand to a number. Unlike binary plus for addition, the unary plus works on a single value and is primarily used for type conversion from non-numeric values to numbers. Syntax +operand Where operand can be any JavaScript value that you want to convert to a number. Using Unary Plus with Numeric Strings The unary plus operator converts string representations of numbers into actual numbers: const x = ...
Read MoreHow to find the binomial coefficient of two integers using JavaScript?
In this tutorial, we are going to learn how to find the binomial coefficient of two integers using JavaScript. Before learning it we should know what binomial coefficient is and what it refers to. What are Binomial Coefficients? Binomial coefficients refer to the positive integers that occur as coefficients in the binomial theorem. A binomial coefficient C(n, k) can be defined as the coefficient of x^k in the expansion of (1 + x)^n. A binomial coefficient of two numbers n and k signifies the number of combinations of k items that can be selected from a ...
Read MoreHow to find every element that exists in any of two given arrays once using JavaScript?
In this tutorial, we will learn how to find every element that exists in any of two given arrays once. This means creating a new array containing all unique elements from both arrays, with no duplicates. For example, given two arrays: Input const arr1 = [1, 2, 3, 4, 5] const arr2 = [1, 4, 9, 16, 25] Output result = [1, 2, 3, 4, 5, 9, 16, 25] Input const arr1 = ['Deepansh', 'Aditya', 'Rishabh', 'Rishit'] const arr2 = ['Vikrant', 'Rishabh', 'Mohit', 'Rishit'] Output result = ['Deepansh', ...
Read MoreHow to find all elements in a given array except for the first one using JavaScript?
In this tutorial, we will learn how to get all elements from an array except the first one using JavaScript. This is a common operation when you need to remove or skip the first element while processing array data. There are two main approaches to accomplish this task: Using the slice() Method (Recommended) The slice() method creates a shallow copy of a portion of an array. When called with index 1, it returns all elements starting from the second element. Syntax array.slice(startIndex) Example ...
Read MoreHow to get the length of a string in bytes in JavaScript?
In JavaScript, getting the length of a string in bytes is different from getting its character count. A byte is a unit of data that is 8 binary bits long, and while most ASCII characters use 1 byte, Unicode characters like emojis or special symbols may use multiple bytes. Here are examples of strings and their byte lengths: Examples: "JavaScript" → 10 bytes (each ASCII character = 1 byte) "20€" → 5 bytes (€ symbol uses 3 bytes in UTF-8) "Tutorials Point" → 15 bytes There ...
Read MoreFabricJS – How to center a Line object horizontally and vertically on a canvas?
In this tutorial, we are going to learn how to center a Line object horizontally and vertically on canvas using FabricJS. A Line element is one of the basic elements provided in FabricJS. It is used for creating straight lines. Because line elements are geometrically one-dimensional and do not contain an interior, they are never filled. We can create a line object by creating an instance of fabric.Line, specifying the x and y coordinates of the line and adding it to the canvas. In order to center the line object horizontally and vertically on the canvas we use the center() ...
Read MoreFabricJS – How to change the format of the URL string of a Line object?
In this tutorial, we are going to learn about how to change the format of the URL string of Line object using FabricJS. A Line element is one of the basic elements provided in FabricJS. It is used for creating straight lines. Because line elements are geometrically one-dimensional and do not contain an interior, they are never filled. We can create a line object by creating an instance of fabric.Line, specifying the x and y coordinates of the line and adding it to the canvas. In order to change the format of the URL string of Line object we use ...
Read MoreReturn the sum of two consecutive elements from the original array in JavaScript
An Array is known as collection of similar data elements which are stored at contiguous memory locations. Array is such a simple data structure where we can access each data element in the array with the help index numbers, which starts from 0. The following is the basic declaration of array in JavaScript − const mobiles = ["SAMSUNG", "ONEPLUS", "APPLE"]; Sum of Two Consecutive Elements of an Array We are required to write a JavaScript function that takes in an array of Numbers and returns a new array with elements as sum of two ...
Read MoreHow to dynamically create radio buttons using an array in JavaScript?
Creating radio buttons dynamically using an array in JavaScript is a useful way to provide users with multiple options for input. When the user clicks on one of the radio buttons, it will be selected and any other choices will be deselected automatically. This process can be automated by looping through an array that contains all the possible values and creating a new radio button element for each item in the array. To dynamically create radio buttons using an array, use the concept of createElement() and appendChild(). Let's look at the concept to understand more about dynamically creating ...
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