JavaScript variable names can be almost unlimited in length, although for practical reasons you’ll probably want to keep your variable names under 10 or 15 characters. Shorter variable names are ...

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 ...

The :String attached to the variable's name tells the computer what type of variable it is and to not accept any other type. This is the reason for the term strictly-typed .