CDATA, the short form of Character Data is a block of code that has been written to prevent parsing by the parser. Sometimes our data includes predefined characters like “ Syntax str.replace("regex", "") Here str is the string from which you want to remove the CDATA, regex is the regular expression to find the block data. Example In the below program example, we remove the CDATA blocks and tags inside a script element using the String replace() method. We pass the regex defined above as an argument to the replace() method and the second argument is an empty string. ... Read More

Before trying to understanding whether HTML comments inside script tags is best practice or not, let us discuss about how to write comments in HTML, what are the different ways to comment in HTML? Generally, comments are helpful to understand the statement, it leaves remainders and provide explanations. It also helps in disabling the statement when we are testing or working on new feature. Syntax Following is the syntax for comment representation − Let us see different ways to represent comments in a program − Inserting a single-line comment The single line comment is applied to single ... Read More

The full form of ECMA is European Computer Manufacturer's Association. ECMAScript is a Standard for scripting languages such as JavaScript, JScript, etc. It is a trademark scripting language specification. JavaScript is a language based on ECMAScript. A standard for scripting languages like JavaScript, JScript is ECMAScript. JavaScript is considered as one of the most popular implementations of ECMAScript.ECMAScript 6 is working fine on web browsers like Chrome, Microsoft Edge, Safari, etc:90% compatibility – Chrome 80% compatibility - Microsoft Edge54% compatibility – SafariUse ES6 using Babale pre-processor, which cross-compile JavaScript back to ECMAScript 5 compatible code.Here are features of ECMAScript 6:Arrow FunctionsDeclare ... Read More

ECMAScript is a standard for JavaScript implementation. You cannot run or download ECMAScript. JavaScript 2.0 conforms to Edition 5 of the ECMAScript standard, and the difference between the two is minor.The 8th edition, known as ECMAScript 2017, came in June 2017. ECMAScript is a Standard for scripting languages such as JavaScript, JScript, etc. It is a trademark scripting language specification. JavaScript is a language based on ECMAScript. A standard for scripting languages like JavaScript, JScript is ECMAScript. JavaScript is considered as one of the most popular implementations of ECMAScript.The ECMA-262 Specification defined a standard version of the core JavaScript language.JavaScript ... Read More

Anonymous FunctionsAnonymous, as the name suggests, allows creating a function without any names identifier. It can be used as an argument to other functions. They are called using the variable name:This is how JavaScript anonymous functions can be used:var func = function() {    alert(‘This is anonymous'); } func();Another example can be the following:setTimeout(function() {    alert('Demo'); }, 3000);JavaScript ClosuresIn JavaScript, all functions work like closures. A closure is a function, which uses the scope in which it was declared when invoked. It is not the scope in which it was invoked.Here’s an example:           ... Read More

In JavaScript, .call and .apply are considered a method of function object..call methodCount the number of arguments with call method. It accepts one or more arguments as objects.Here’s the syntax:.call(object, “argument1”, “argument2”);.apply method To use an array as an argument, use .apply. It requires an array as its 2nd argument.Here’s the syntax:.apply(object, [“argument1”, “argument[]”]);ExampleLet’s see an example showing both call and apply method:                                 var p = {                q: "Hello"             } ... Read More

To avoid parsing the symbols &, it is added in …. It is not needed in HTML. Let us see how CDATA is added in tags:    // Note: CDATA is now deprecated. Do not use.The CDATA Section interface is used within XML for including extended portions of text. This text is unescaped text, like < and & symbols. These symbols do not want to escape.It is used like this:

The double negation(!! ) operator is the! Operator twice and calculates the truth value of a value. It returns a Boolean value, which depends on the truthiness of the expression.Consider (!!p) as !(!p), here’s an example:If p is a false value, !p is true, and !!p is false. If p is a true value, !p is false, and !!p is true.Here’s another example:0 === false is false. !!0 === false is true. !!0 === false !!parseInt("foo") === false !!1 === true !!-1 === true !!false === false !!true === true

  npmnpm is generally used for managing Node.js modules and does nested dependency tree. It also works for front-end and used for developer tools like Grunt, CoffeeScript, etc.Without using nested dependencies it is difficult to avoid dependency conflicts. So, using npm has proven to be great.Whatever you add in Node is structured as modules. On using NPM for browser-side dependencies, you'll structure your code like Node.Here’s the dependency structure:project root [node_modules] -> dependency P -> dependency Q [node_modules] -> dependency P -> dependency R [node_modules] -> dependency Q [node_modules] -> dependency P -> dependency SBower Bower requires a flat dependency tree and ... Read More

In this tutorial, we will learn how to include JavaScript in HTML Documents. To include JavaScript in HTML Documents, use the tag. JavaScript can be implemented using JavaScript statements that are placed within the ... . You can place the tags, containing your JavaScript, anywhere within your web page, but it is normally recommended that you should keep it within the tags. We will discuss the following three approaches to include JavaScript in HTML documents − Embedding code (within head or body) Inline Code (inside any element) External file (outside the HTML file) By Embedding ... Read More