JavaScript is the most popular programming language in the world, making it a programmer's great choice. Once you learn JavaScript, it helps you develop great front-end and back-end software using different JavaScript based frameworks like jQuery, Node.JS, etc. JavaScript is everywhere, it comes installed on every modern web browser and so to learn javascript coding interview questions for freshers, you really do not need any special environment setup. For example, Chrome, Mozilla Firefox, Safari, and every browser you know as of today, supports JavaScript. JavaScript helps you create really beautiful and crazy fast websites. You can develop your website with a console like look and feel and give your users the best Graphical User Experience.
After HTML and CSS, JavaScript is the third biggest web technology. JavaScript is a scripting language that may be used to construct online and mobile apps, web servers, games, and more. JavaScript is an object-oriented programming language that is used to generate websites and applications. It was created with the intention of being used in a browser. Even today, the server-side version of JavaScript known as Node.js may be used to create online and mobile apps, real-time applications, online streaming applications, and videogames. Javascript frameworks, often known as inbuilt libraries, may be used to construct desktop and mobile programs. Developers may save a lot of time on monotonous programming jobs by using these code libraries, allowing them to focus on the production work. What is the use of the isNaN function? The number isNan function determines whether the passed value is NaN (Not a number) and is of the type “Number”. In JavaScript, the value NaN is considered a type of number. It returns true if the argument is not a number, else it returns false. What is negative infinity? The negative infinity is a constant value represents the lowest available value. It means that no other number is lesser than this value. It can be generate using a self-made function or by an arithmetic operation. JavaScript shows the NEGATIVE_INFINITY value as -Infinity. What is the ‘this’ keyword in JavaScript? Functions in JavaScript are essential objects. Like objects, it can be assign to variables, pass to other functions, and return from functions. And much like objects, they have their own properties. ‘this’ stores the current execution context of the JavaScript program. Thus, when it use inside a function, the value of ‘this’ will change depending on how the function is defined, how it is invoked, and the default execution context. What is the disadvantage of using innerHTML in JavaScript? There are lots of disadvantages of using the innerHTML in JavaScript as the content will replace everywhere. If you use += like “innerHTML = innerHTML + ‘html’” still the old content is replaced by HTML. It preserves event handlers attached to any DOM elements. Explain is Scope in JavaScript? In JavaScript, each function gets its own scope. The scope is basically a collection of variables as well as the rules for how those variables are accessed by name. Only code inside that function can access that function's scoped variables. A variable name has to be unique within the same scope. A scope can be nested inside another scope. If one scope is nested inside another, code inside the innermost scope can access variables from either scope. How do you debug a JavaScript code? All modern web browsers like Chrome, Firefox, etc. have an inbuilt debugger that can be accessed anytime by pressing the relevant key, usually the F12 key. There are several features available to users in the debugging tools. We can also debug a JavaScript code inside a code editor that we use to develop a JavaScript application—for example, Visual Studio Code, Atom, Sublime Text, etc. What’s the difference between let and var? Both let and var are used for variable and method declarations in JavaScript. So there isn’t much of a difference between these two besides that while var keyword is scoped by function, the let keyword is scoped by a block. What are Closures in JavaScript? Closures provide a better, and concise way of writing JavaScript code for the developers and programmers. Closures are created whenever a variable that is defined outside the current scope is accessed within the current scope. function hello(name) { var message = "hello " + name; return function hello() { console.log(message); }; } //generate closure var helloWorld = hello("World"); //use closure helloWorld(); Self Invoking Functions Self Invoking Functions is an automatically invoked function expression followed by (), where it does not need to be requested. Nevertheless, the declaration of the function is not able to be invoked by itself. Use of JAVASCRIPT in programming Client side validation − This is really important to verify any user input before submitting it to the server and JavaScript plays an important role in validating those inputs at front-end itself. Manipulating HTML Pages − JavaScript helps in manipulating HTML page on the fly. This helps in adding and deleting any HTML tag html5 interview questions for 5 years experience very easily using JavaScript and modify your HTML to change its look and feel based on different devices and requirements. User Notifications − You can use JavaScript to raise dynamic pop-ups on the webpages to give different types of notifications to your website visitors. Back-end Data Loading − JavaScript provides Ajax library which helps in loading back-end data while you are doing some other processing. This really gives an amazing experience to your website visitors. Presentations − JavaScript also provides the facility of creating presentations which gives website look and feel. JavaScript provides RevealJS and BespokeJS libraries to build a web-based slide presentation.
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