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Easy math decimals for JS

metic.add(0.1, 0.2, 2) === 0.3

This is a simple and useful package to help you on arithmetics.

If you've ever tried to sum decimal numbers in JavaScript, you were definitely surprised...

We know that0.1 + 0.1 is, as you expect,0.2.

But sometimes you get some unexpected result.

As for0.1 + 0.2.

The result is not0.3 as you would expect, but it is0.30000000000000004.

Yes, the first time I was surprised too. However, if you search further to find out what happens via these links:

• Why 0.1 + 0.2 == 0.3 is false in JS?
• Why 0.1 + 0.2 ≠ 0.3 in JavaScript

npm install metic

importmeticfrom'metic'// import {metic} from 'metic'metic.add(0.1,0.2)// => 0.3

You can also use as many decimals places as you like and ensure the value will be as close to what you expect.

importmeticfrom'metic'// import {metic} from 'metic'/** * Calculate the sum of two decimals properly. *@param {number} a - First value to be considered in the sum. *@param {number} b - Second value to be considered in the sum. *@param {number} positions - Number of decimals we expect as our result. */metic.add(0.1,0.222,3)// => 0.322

MIT