01 toPower.md

Similar js toExponential method, but returns result in power format, instead of Xe-1 it returns X⋅10⁻¹

Usage example:

console.log(toPower(3, 111)); // out 1.110⋅10²
console.log(toPower(3, 0.00000000000000123)); //out 1.230⋅10⁻¹⁵

02 toPower.js

export const toPower = (fractionDigits, value) => (
  ([, num, sign, exp], supNums, supMinus) =>
    `${num}⋅10${sign && supMinus}${[...exp].map(v => supNums[+v]).join()}`
)(
  (/([\d\.]+)e([-]*)[+]*(\d+)/).exec(value.toExponential(fractionDigits)),
  ['⁰', '¹', '²', '³', '⁴', '⁵', '⁶', '⁷', '⁸', '⁹'],
  '⁻'
);