How to convert a positive number to a negative in JavaScript

Ever found yourself in a situation where you needed to flip the sign of a positive number in JavaScript? It’s a common task, and luckily, it’s a piece of cake to achieve. In this quick guide, we’ll explore a couple of methods to turn those positive vibes into negative ones with just a few lines of JavaScript.

The Basics

Using the Minus Operator

The most straightforward way to convert a positive number to negative is by simply using the minus operator (-). Let’s say you have a variable positiveNumber with a value of 42:

By applying the minus operator to positiveNumber, you get its negative counterpart stored in negativeNumber.

Multiplying by -1

Another method involves multiplying the positive number by -1:

This achieves the same result as using the minus operator, providing you with a quick and effective way to flip the sign.

When to Use Each Method

Both methods work like a charm, so which one should you choose? It often comes down to personal preference and the context of your code. If you’re all about brevity and simplicity, the minus operator is your go-to. On the other hand, if you prefer explicitness and want to make it clear you’re converting to a negative value, the multiplication method might be more your style.


Converting positive numbers to negative in JavaScript is a snap, thanks to the versatility of the language. Whether you prefer the elegance of the minus operator or the clarity of multiplication, you now have the tools to flip those signs whenever the need arises.

Happy Coding!

Remember, the beauty of coding lies in finding simple solutions to everyday challenges.

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