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Converts a javascript number from scientific notation to a decimal string
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var scientificToDecimal = function (num) { | |
var nsign = Math.sign(num); | |
//remove the sign | |
num = Math.abs(num); | |
//if the number is in scientific notation remove it | |
if (/\d+\.?\d*e[\+\-]*\d+/i.test(num)) { | |
var zero = '0', | |
parts = String(num).toLowerCase().split('e'), //split into coeff and exponent | |
e = parts.pop(), //store the exponential part | |
l = Math.abs(e), //get the number of zeros | |
sign = e / l, | |
coeff_array = parts[0].split('.'); | |
if (sign === -1) { | |
l = l - coeff_array[0].length; | |
if (l < 0) { | |
num = coeff_array[0].slice(0, l) + '.' + coeff_array[0].slice(l) + (coeff_array.length === 2 ? coeff_array[1] : ''); | |
} | |
else { | |
num = zero + '.' + new Array(l + 1).join(zero) + coeff_array.join(''); | |
} | |
} | |
else { | |
var dec = coeff_array[1]; | |
if (dec) | |
l = l - dec.length; | |
if (l < 0) { | |
num = coeff_array[0] + dec.slice(0, l) + '.' + dec.slice(l); | |
} else { | |
num = coeff_array.join('') + new Array(l + 1).join(zero); | |
} | |
} | |
} | |
return nsign < 0 ? '-'+num : num; | |
}; |
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var expect = function(value) { | |
return { | |
toEqual: function(otherValue) { | |
if(value !== otherValue) { | |
console.error(value+' did not yield the correct result!'); | |
} | |
} | |
}; | |
}; | |
expect(scientificToDecimal(2.5e25)).toEqual('25000000000000000000000000'); | |
expect(scientificToDecimal(-1.123e-10)).toEqual('-0.0000000001123'); | |
expect(scientificToDecimal(-1e-3)).toEqual('-0.001'); | |
expect(scientificToDecimal(-1.2e-2)).toEqual('-0.012'); | |
expect(scientificToDecimal(12.12)).toEqual(12.12); | |
expect(scientificToDecimal(141120000000000000)).toEqual(141120000000000000); | |
expect(scientificToDecimal('0')).toEqual(0); | |
expect(scientificToDecimal(1.23423534e-12)).toEqual(0.00000000000123423534); |
did you find any solution for this?
Yes, check out from-exponential. Also in case you're doing Ethereum development, check out my package evm-bn, which you can use like this:
import { toBn } from "evm-bn";
// 3141500000000000000
const foo: BigNumber = toBn("3.1415");
I write the simple to convert the SN to RN checkout this code
https://github.com/zohaibtahir/Math-Calculations/blob/main/Scientific-notation-to-real_number.js
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@PaulRBerg
it doesnt work for me if number is "115792089237316195423570985008687907853269984665640564039457584007913129639935"
it returns "115792089237316200000000000000000000000000000000000000000000000000000000000000"
did you find any solution for this?