Search Results for: javascript string

isNaN() is a JavaScript function that will tell you whether a value is equal to NaN – or Not a Number. It can be used to determine whether the result of a mathematical operation is valid or not. Here’s how to use it. What is NaN? NaN is a special value that means Not a Number. It means that a value that should be a number could not be parsed as a number. Any mathematical operation between any other value and NaN will result in NaN. It usually means something has … Read more

This article will explain what JavaScript and jQuery are, how they differ, and how/why they should be used. What is JavaScript JavaScript began life in the mid-1990s as a scripting language for adding interactivity to web pages. Over time it has been developed into a full-featured programming language, which can even be run outside the web browser (more detail on this in our Node.js article). You can also see our article outlining the differences between JavaScript and Typescript here. What is jQuery? jQuery is a library written in JavaScript. … Read more

This article will show you how to use the parseInt() function in the JavaScript programming language. JavaScript is notoriously loosely typed – meaning that variables of one type (e.g., strings of text, numerical values, boolean values) are converted to others, allowing you to perform mathematical operations on strings and silly things like that. This causes all sorts of issues – strings containing numbers may not be parsed to the expected value, and all of a sudden, you have angry clients wondering why your shiny new … Read more

This article will discuss the differences between typescript and JavaScript, the problems they solve, and which is best to use. I really like TypeScript, and I use it a lot. It solves so many of JavaScript’s problems and makes writing good JavaScript code much easier (once you’ve learned to use TypeScript). So, this article is more about why you should use TypeScript (when you can use it), when/where you can use it, and the problems it solves. This article goes well with the following articles, giving you an … Read more

The JavaScript eval() function executes a string as JavaScript. This is a massive security risk as, if used in production, it can allow third parties to execute their own code in your app. eval() Syntax eval(string) Note that: string is a string that contains JavaScript Code eval() will return the value returned by executing the code in the string Just don’t use it Example of Javascript eval() This article gets one example only so you can see how eval() works, so that if you accidentally fall on your keyboard and the … Read more

let, var, and const are all JavaScript statements that assign a value to a variable. Their behavior can differ depending on how and where they are used in your code – read on to find out the details. Scopes in JavaScript As you start to build more complex applications, you’ll start to see a lot of talk about scopes. A variable’s scope defines where it is available in your application. Global Scope (Global Variables) If a variable is in the global scope, it is available anywhere in your application. It can be called … Read more

This tutorial will show you how to check whether an array contains a specific value in Javascript, with full examples. JavaScript is a flexible programming language that runs just about everywhere. You can run JavaScript apps in web browsers, build command-line apps you can run in the terminal, mobile apps can be built using platforms like Cordova, and server processes can be written on platforms like Node.js. Naturally, Linux is the environment of choice for many JavaScript developers and is perfect for learning tools like … Read more

There are multiple ways to remove an element from an array in Javascript. We cover all of the methods that can be used in this tutorial. JavaScript is a flexible programming language that runs just about everywhere. You can run JavaScript apps in web browsers, build command-line apps you can run in the terminal, mobile apps can be built using platforms like Cordova, and server processes can be written on platforms like Node.js. Naturally, Linux is the environment of choice for many JavaScript developers and … Read more

JavaScript has quickly become one of the most popular programming languages due to its ease of use and flexibility – it can be run in just about any web browser on any device making it perfect for cross-platform apps. Linux is the most popular platform for hosting JavaScript Apps built with Node.js and is a great platform for developing both standalone JavaScript programs and browser-based solutions. If you’re learning JavaScript the if… else control structure is one of the first things you’ll want to get the hang … Read more