Nowadays JavaScript has three different keywords to declare a variable — var, let and, const. Each has its own properties and particularities. Let’s start by making a simple comparison table ...

This is a very unorthodox type of function, one that is impractical and only used here to demonstrate a potential use of global variables. It works, but it’s clumsy and more awkward to use.

JavaScript variables hold a wide variety of information and can be used with virtually any data type. Here's how to use variables to store numbers, text strings, objects, and more.

After adding "y" to "x," JavaScript stores "11.234" in the "z" variable. You can control the number of decimal points that appear in a result by using the "toFixed" function. Instead of adding "x ...