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djD-REK/Using exponential notation to prevent rounding errors.js

Created June 10, 2020 01:54
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Using exponential notation to prevent rounding errors.js
console.log(Number(Math.round(1.005 + "e2") + "e-2")) // 1.01
const roundAccurately = (number, decimalPlaces) => Number(Math.round(number + "e" + decimalPlaces) + "e-" + decimalPlaces)
console.log(roundAccurately(1.005, 2)) // 1.01
@y-a11y
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y-a11y commented Apr 26, 2021

@DoctorDerek Thank you so much! This makes a lot more sense now

@cccabdalla
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@hamidgasmi Nope! JavaScript's built-in math isn't great if you actually need precision or are working with exponential notation. I'd recommend using a library. MathJS is a good place to start. https://mathjs.org/

great, thanks.

very helpful.

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