Use Separators to Make Your Number Literals More Readable

Let's imagine you have a really big number like this

let billion = 1000000000;

This seems to be quite difficult to read. Since this is a number and not a string, you can't simply add commas to make it more readable.

let billion = 1,000,000,000; //This will give you an error

The good news is that most modern browsers and Node.js support numeric separators, which are underscores that can be placed within numeric literals to break them up into more manageable chunks. Using numeric separators, you can rewrite it as

let billion = 1_000_000_000;

Numeric separators can even be used directly within functions and operators. For example, you can still do things like

let billionInverse = 1 / 1_000_000_000; //1e-9