JavaScript also supports global variables, which have scope throughout the program. Here’s an alternative version of the factorial function that requires you to set a global variable before you ...

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 ...

Global variables are a common source of logic errors, so keeping a variable in the smallest scope is always good practice. Conclusion Although variables are a fairly simple aspect of JavaScript ...