How to get the result of a Javascript BigInt division in significants and exponent

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How to get the result of a Javascript BigInt division in significants and exponent



I would like to divide two BigInt numbers and get the result as some significant digits and an exponent. I have got this so far:


f = (numerator, denominator, significantsLength) =>
const denominatorLength = ('' + denominator).length
const extension = significantsLength + denominatorLength
const extendedNumerator = numerator * 10n ** BigInt(extension)
const div = extendedNumerator / denominator
const divLength = ('' + div).length
const digitsSurplus = divLength - significantsLength
const significants = div / 10n ** BigInt(digitsSurplus)
const exponent = digitsSurplus - extension
return significants + 'e' + exponent



so f(1n,3n,3) results in '333e-3'


f(1n,3n,3)


'333e-3'



Could it be better? This code does not round up. It also does not work well with zero and negative numbers.









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