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 that 0.1 + 0.1 is, as you expect, 0.2.
But sometimes you get some unexpected result.
As for 0.1 + 0.2.
The result is not 0.3 as you would expect, but it is 0.30000000000000004.
Yes, the first time I was surprised too. However, if you search further to find out what happens via these links:
npm install meticimport metic from 'metic'
// import {metic} from 'metic'
metic.add(0.1, 0.2) // => 0.3You can also use as many decimals places as you like and ensure the value will be as close to what you expect.
import metic from '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