Found 6704 Articles for Javascript

In JavaScript, Semicolons are optional. Simple statements in JavaScript are generally followed by a semicolon character, just as they are in C, C++, and Java. JavaScript, however, allows you to omit this semicolon if each of your statements is placed on a separate line. It is a good programming practice to use semicolons.For example, the following code could be written without semicolon.     But when formatted in a single line as follows, you must use semicolons −    

JavaScript ignores spaces, tabs, and newlines that appear in JavaScript programs. You can use spaces, tabs, and newlines freely in your program and you are free to format and indent your programs in a neat and consistent way that makes the code easy to read and understand.JavaScript ignores whitespaces. For example, the following are same:var employee = "Amit"; var employee="Amit";Line breaks in JavaScript:           Line-break in an alert box. Click below button.       Click    

This tutorial teaches us to replace newlines with spaces in JavaScript. Often, programmers find unusual line breaks in the string, and the random line breaks look weird when we render them on the webpage using JavaScript.So, the solution is that programmers just need to remove the line breaks and join the string with the space or other characters. Here, we have different approaches to solving this problem, and we will use the regular expression with the replace() method to remove the unusual line breaks.Using the replace() MethodUsing the split() and join() MethodsUsing the replace() MethodIn this approach, we will use ... Read More

Method and a function are the same, with different terms. A method is a procedure or function in object-oriented programming.A function is a group of reusable code which can be called anywhere in your program. This eliminates the need for writing the same code again and again. It helps programmers in writing modular codes.The following is the syntax of a JavaScript function:     Here’s an example:    

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

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: