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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 More
The spread (…) operator of JavaScript is used to expand an array or any other iterable into individual elements. It was introduced in ECMAScript 2015 (ES6). 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. You can simply create a copy of any existing array with the spread operator. The basic syntax of the spread operator is mentioned below - const newArray = [...existingArray]; Usage on Arrays The spread operator has ... Read More
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 More
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 More
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 More
A foreign key is a field (or collection of fields) in one table that refers to the primary key in another table. The table containing the foreign key is called the child table, and the table containing the primary key is called the parent table. A foreign key ensures that the value in the foreign key column must match a value in the primary key column of the referenced table, maintaining referential integrity between the two tables. Characteristics of a Foreign Key A foreign key creates a relationship between two tables. ... Read More
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 More
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 More
In Java, objects may be initialized in various ways for different purposes. When a class is implementing the Cloneable interface, it opens up one more way of creating object instances. What is Cloneable Interface? Cloneable interface in Java states that a class can clone its objects. It enables the class to make a copy of itself using the clone() method. If the class is not Cloneable, the clone() method called on its object would throw an error. Different Approaches Consider a class Tester that has implemented a Cloneable interface. Now you can initialize an object using the following three ways ... Read More
Before getting into the ways of creating a file using Bash, let's first understand how Linux treats its files. Linux organizes all its data into files and files are organized into directories. Further, the directories are organized into tree-like structures called the file system. When you have to work in a Linux environment, you would definitely have to spend a lot of your time working on different types of files. There are several different ways in which one can create a file in Linux. You can create a file from the Bash Shell or you can use the Desktop File ... Read More