In fact, the browser is responsible for running JavaScript code. How to Run JavaScript?īeing a scripting language, JavaScript cannot run on its own. The syntax of JavaScript is mostly influenced by the programming language C. Java is a very complex programming language whereas JavaScript is only a scripting language. In fact, JavaScript and Java are very much unrelated. There are many programmers who think that JavaScript and Java are the same.

The language was initially called LiveScript and was later renamed JavaScript. JavaScript was developed by Brendan Eich in 1995, which appeared in Netscape, a popular browser of that time. JavaScript is also being used widely in game development and Mobile application development. In other words, you can make your webpage more lively and interactive, with the help of JavaScript. JavaScript is used mainly for enhancing the interaction of a user with the webpage. This tutorial taught you three different ways to check if a value is a number in JavaScript.JavaScript is a very powerful client-side scripting language. You can also run a comparison by writing a conditional statement: var value = 123 if (typeof(value) = 'number') ) - true isNaN(2) - false isNaN(2.4) - false Conclusion Instead of providing a boolean response, the value's data type is returned: typeof(123) - number typeof(-123) - number typeof('123') - string typeof() - object The method returns true if the value is numeric, and false if it isn't: Number.isInteger(123) - true Number.isInteger(-123) - true Number.isInteger('123') - false Number.isInteger(4 / 2) - true Number.isInteger(5 / 2) - false The typeof() OperatorĪnother way to check if a value is a number is with the typeof() operator.

The isInteger() method in JavaScript accepts a single parameter, the value being tested.

In this tutorial, we'll explore three different ways to check if a value is a number in JavaScript, using the isInteger(), typeof(), and isNaN() methods.

Javascript is