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Javascript Articles
Page 100 of 534
Set JavaScript object values to null?
Setting object values to null can help reset data, free up memory, or show that a value is no longer needed. In JavaScript, the null value is used to indicate that there is an intentional absence of any object value. This article provides various methods for setting JavaScript object values to null and what that means. Setting an Object's values to null Setting object values to null can be done in two types: For Specific Object Value For Multiple Object Value For Specific Object Value Setting the specific ...
Read MoreSpread operator in function calls JavaScript
The spread operator in function calls enhances the function parameter handling. The spread operator allows you to expand an array or any iterable across zero or more arguments in a function call. This article will guide you on using the spread operator in a function call. The spread operator is a powerful feature of JavaScript that allows one to perform operations for complex and lengthy code in a simple single line of code. The spread operator is denoted by the (...) (triple dot) symbol. Syntax The basic syntax of spread operator for function calls is mentioned below: functionName(...iterableObject) ...
Read MoreWhy is isNaN(null) == false in JS?
The isNaN() function in JavaScript is used to check whether a given value is NaN. This function converts the argument to a number first, then checks if it's NaN. When you pass null to isNaN(), it returns false, which can be surprising. This happens because of JavaScript type coercion when using isNaN(). In this article, we will understand why isNaN returns false for null. Understanding isNaN and Type Coercion in Js Before moving forward in this article you need to understand the following key concepts of this article: isNaN in Js: The isNaN() function ...
Read MoreJavaScript Program to Find Perimeter of a Triangle
The perimeter of a triangle is the sum of the lengths of its three sides. You can find the perimeter of a triangle using JavaScript by finding the sum of all sides of the triangle, as the perimeter of the triangle refers to the sum of all three sides of the triangle, i.e., perimeter = a + b + c. To find the perimeter of a triangle using JavaScript, we need to write a function that calculates the sum of three sides of a triangle and returns the triangle's perimeter as an output. In this article, we will understand the ...
Read MoreWhat is the difference between a method and a function?
In this article, we will learn about the difference between a method and a function in Javascript. Method and a function are the same, with different terms. A method is a procedure or function in object-oriented programming. What is a Function? A function is a group of reusable code that can be called anywhere in your program. This removes the necessity to repeat the same code over and over, assisting developers in writing modular code. JavaScript functions can be defined in a number of ways, such as function expressions, arrow functions, or the function keyword. The following is the syntax ...
Read MoreWhat are some JavaScript Development Tools?
One of the major strengths of JavaScript is that it does not require any expensive development tools. You can start with a simple text editor such as Notepad. Since it is an interpreted language inside the context of a web browser, you don't even need to buy a compiler. To make our lives simpler, various vendors have come up with very nice JavaScript editing tools. Some of them are listed here − Code Editors and IDEs A quality code editor is the backbone of any JavaScript development process. Visual Studio Code (VS Code) is a ...
Read MoreJavascript search for an object key in a set
In JavaScript, to search for an object key in a Set, you need to understand how Sets store values and how objects behave in JavaScript. JavaScript Sets are useful objects that store unique values, making them excellent for handling distinct data. In this article, we'll explore different ways to search for an object key in a Set. JavaScript Set A Set in JavaScript is a collection of unique values. Values like numbers and strings can be compared directly, but objects are stored by reference. This means that even if two objects have the same properties, they are still seen ...
Read MoreJavaScript code to extract the words in quotations
Extracting text enclosed in quotation marks is a common task in programming, especially when working with strings that include quotes. In JavaScript, strings are a data type used to represent text. A string is a sequence of characters enclosed in single quotes ('), double quotes ("), or backticks (`). In JavaScript, strings are a data type used to represent text. JavaScript provides multiple ways to extract text enclosed in quotation marks. This article explains how to extract words or phrases inside quotations from a string efficiently. Extracting text enclosed in quotation marks Extracting text enclosed in quotation marks can ...
Read MoreJavaScript program to get a variable to count up/down on keyboard press.
When working with JavaScript, handling keyboard events and creating a program that gets a variable to count up/down on keyboard press can be an essential skill. Keyboard events such as keydown and keyup in JavaScript are actions that occur when a user interacts with the keyboard. This article explains how to create a JavaScript program that increments or decrements a variable based on specific keyboard key presses. This feature can be helpful in interactive websites, like games or tools that check user input. Table of Content You can create a JavaScript program to get a variable to count up ...
Read MoreJavaScript fetch a specific value with eval()?
The eval() function in JavaScript allows the execution of code stored as a string. It can be used to fetch specific values dynamically, but be careful, as it can have security risks and affect performance. This article will guide you on how to use eval() to get specific values and why you should generally avoid using eval(). How eval() Works? The eval() function takes a string as an argument and evaluates it as JavaScript code. For example: console.log(eval("2 + 2")); // Output: 4 Fetching Specific Values Using eval() The eval() function in JavaScript can be used to: ...
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