@fractorysolutions/safe-units/src/exponent/exponentValueArithmetic.ts

Type-safe TypeScript units of measure

import { Exponent } from "./generated/exponent";

export function getExponentValue(value: Exponent): number {
  return parseInt(value, 10);
}

export const negateExponent = (value: Exponent) =>
  toExponent(-getExponentValue(value));
export const addExponents = wrapBinaryExponentFn((left, right) => left + right);
export const multiplyExponents = wrapBinaryExponentFn(
  (left, right) => left * right,
);
export const divideExponents = wrapBinaryExponentFn(
  (left, right) => left / right,
);

type BinaryExponentFn = (left: Exponent, right: Exponent) => Exponent;

function wrapBinaryExponentFn(
  fn: (left: number, right: number) => number,
): BinaryExponentFn {
  return (left, right) =>
    toExponent(fn(getExponentValue(left), getExponentValue(right)));
}

function toExponent(value: number): Exponent {
  return `${value}` as Exponent;
}