Javascript Articles - Page 381 of 534

In JavaScript, objects are the collection of a key value pairs. The properties of the object are the keys and is denoted with a string. The value of the key is the value of the property of the given object. In JavaScript, the objects can be copied to other by many ways in which some of them are − Using spread operator(…) The spread operator in JavaScript is used to copy the values of the original given object to a new object. This operator is represented by three dots(…). Example 1 This example demonstrates how spread operator is used to ... Read More

Memory management in JavaScript is much easier than in low-level languages like C or C++. Unlike low-level languages, JavaScript automatically detects which objects will be needed in later cases and which will be garbage that is occupying memory without any reason. In this article, we shall discuss how garbage collection (GC) works in JavaScript. There are a few important parts that we are going to discuss in detail− Reachability from root Interlinked Objects (interconnections between different objects) Unreachable Collections (Broken link) Reachability The first concept of memory management is reachability. In this mode, the garbage collector tries to ... Read More

JavaScript is widely used to create interactive web pages. It has many frameworks such as React JS, Angular JS, Node JS, etc. Like any other programming language, JavaScript also provides operators like arithmetic, relational, comparison operators, etc. The equality operator, i.e., "==" is one such comparison operator that checks whether the LHS is equal to RHS or not. This operator is present in all other programming languages but it is somewhat different in JavaScript. This is due to the fact that JavaScript is a loosely typed language, whereas all other languages are strictly typed. As JS is loosely typed, it ... Read More

Memory management is an essential task when writing a good and effective program in some programming languages. This article will help you to understand different concepts of memory management in JavaScript. In low-level languages like C and C++, programmers should care about the usage of memory in some manual fashion. On the other hand, Javascript automatically allocates memory when objects are created into the environment and also it cleans the memory when an object is destroyed. JavaScript can manage all of these on its own but this does not imply that the developers do not need to worry about the ... Read More

Web Garden is the web hosting system which comprises of multiple “processes”. This means that we have a single server on which we run multiple processes. This type of hosting provides logical scalability to our web applications.Web Farm is the web hosting system which comprises of multiple “computers”. This is different from web-garden as web garden runs on a single server while a web farm runs across multiple servers. This provides physical scalability to out web applications. This type of set up is achieved using Load balancers to balance calls coming to the server using a dedicated process that forwards ... Read More

In JavaScript, window.onload and document.ready() are the methods used when the page is being loaded. Window.onload The window.onload method gets executed after the entire web page is loaded. This includes all the elements related with DOM like the head tag, tittle tag and all the other tags including the style sheets, images and videos. The onload method is used by passing a function to it. The called function will be executed after the object is loaded. Syntax This is the syntax of onload method − Window.onload = function() Window.onload = (event) => {} //arrow function Example 1 This example ... Read More

In JavaScript, there are two different programming paradigms. The sloppy mode, sometimes referred to as the simple mode, is activated by default. We don't have to write the code strictly according to guidelines in this manner. On the other side, there is also the stringent mode. This setting allows the environment to have some rigid constraints. Strict mode has different meanings than regular code and is not a subset of sloppy mode. This article will explain how to enable strict mode in JavaScript and will also go over some of the features of "Strict" Mode. Syntax Different scopes can allow ... Read More

This tutorial will explain you what are the different characteristics of JavaScript 'Strict Mode'. As such, there are two different modes of programming in JavaScript. By default, the simple mode or sometimes known as the sloppy mode is enabled. In this mode, we do not need to follow strict rules while writing the code. On the other hand, the strict mode is also there. This mode enables some strict rules in the environment. Strict mode is not a subset of the sloppy mode but it also has different semantics than normal code. Syntax Strict modes can be ... Read More

The type of operating system used in the client machine can be detected using some of the functions in JavaScript. The different functions are discussed below. Using navigator.appVersion This property will return the information about the browser and the operating system being used in the form of a string. Syntax The syntax for the navigator.appVersion is given below. navigator.appVersion Example 1 This example demonstrates the usage of navigator.appVersion to detect client OS − Click to get the operating system Operating System ... Read More

HTML stands for Hyper Text Markup Language, through the HTML we can design a block of webpages. Html is a frontend markup language that is used to build the content of frontend pages. It means that we can build a structure of web pages. Through HTML we can design the content of any website. It means that we can create headings, buttons, paragraphs, headers, footers, links, etc for any website. Example let’s try to understand to implement a program − Basic of ... Read More