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 ...

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.

The "+=" operator tells JavaScript to add the variable on the right side of the operator to the variable on the left. Floating-Point Addition Floating-point numbers, such as 1.234, contain decimal ...

When we think about storing data for later, we often turn to variables, which simply store data for later use. ... JavaScript tutorial: Higher-order functions. Apr 18, 2019 4 mins. how-to.