There are two kinds of object variables in JavaScript: Variables that contain built-in browser-related objects—window, document, and so on. These are references to objects you did not create.

If the first text box contains "1" and the second text box contains "2," JavaScript appends those two values instead of adding them, and stores "12" in the "z" variable. Prevent this from ...

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 ...