Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. To invert number look at it and write it from opposite direction or the output of code is a number obtained by writing original number from right to left. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Never use eval(). W3Schools offers free online tutorials, references and exercises in all the major languages of the web. operation, Returns the code of the key that triggered the event, Returns whether the event is composed or not, Returns whether the "CTRL" key was pressed when the mouse event was triggered, Returns whether the "CTRL" key was pressed when the key event was triggered, Returns the element whose event listeners triggered the event, Returns an object containing the data being dragged/dropped, or reverse (). How do you reverse each word in a given string? For a tutorial about Events, read our JavaScript Events Tutorial. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. You do that by passing the number of lines - 1 as an argument. Number.isNaN() is an ECMAScript6 (ES6) feature. the surface, Returns the URL of the changed item's document, Returns a reference to the Window object where the event occurred. if a number is Not-a-Number. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. parseInt will return an integer found in the beginning of the string. Number.isNaN() returns true Format a number into a string, using locale settings: Format a number into a string, using the locale specific of FINLAND: Format a number into a currency string, using the locale specific of USA: The toLocaleString() returns a number as a string, using local language format. The first argument of parseInt must be a string. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. In this tutorial, youll see how to reverse a number in JavaScript. If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: W3Schools is optimized for learning and training. The Number.isNaN() method returns true W3Schools offers free online tutorials, references and exercises in all the major languages of the web. To do this: Use repeat() to determine the number of spacer characters for each line. Example: Javascript