@ryanuo/utils/dist/lib/finance/calculator.mjs

提供多种实用工具函数，涵盖算法、浏览器操作、网络请求等多个领域

import { Decimal } from "decimal.js";
export const decimal = Decimal;
decimal.set({ precision: 20, rounding: Decimal.ROUND_HALF_UP });
export function preciseAdd(...args) {
  return args.reduce(
    (sum, num) => sum.plus(new Decimal(num)),
    new Decimal(0)
  );
}
export function preciseSub(a, b, ...moreNumbers) {
  let result = new Decimal(a).minus(new Decimal(b));
  for (const num of moreNumbers)
    result = result.minus(new Decimal(num));
  return result;
}
export function preciseMul(...args) {
  if (args.length === 0)
    return new Decimal(0);
  return args.reduce(
    (product, num) => product.times(new Decimal(num)),
    new Decimal(1)
  );
}
export function preciseDiv(a, b, ...moreDivisors) {
  let result = new Decimal(a).dividedBy(new Decimal(b));
  for (const num of moreDivisors)
    result = result.dividedBy(new Decimal(num));
  return result;
}
export function roundTo(num, decimalPlaces = 2) {
  if (decimalPlaces < 0)
    throw new Error("Decimal places must be a non-negative integer");
  return new Decimal(num).toDecimalPlaces(decimalPlaces);
}
export function compare(a, b) {
  return new Decimal(a).comparedTo(new Decimal(b));
}
export function calculatePercentage(part, total, options) {
  if (Number(total) === 0)
    return "NaN";
  const { decimalPlaces = 2, isSymbol = false } = options || {};
  if (isSymbol) {
    return `${preciseDiv(part, total).times(100).toFixed(decimalPlaces)}%`;
  } else {
    return preciseDiv(part, total).times(100).toFixed(decimalPlaces);
  }
}
export class CalculatorChain {
  value;
  constructor(num) {
    this.value = new Decimal(num);
  }
  /**
   * 加法
   * @param num 数字或字符串
   */
  add(num) {
    this.value = this.value.plus(new Decimal(num));
    return this;
  }
  /**
   * 减法
   * @param num 数字或字符串
   */
  sub(num) {
    this.value = this.value.minus(new Decimal(num));
    return this;
  }
  /**
   * 乘法
   * @param num 数字或字符串
   */
  mul(num) {
    this.value = this.value.times(new Decimal(num));
    return this;
  }
  /**
   * 除法
   * @param num 数字或字符串
   */
  div(num) {
    if (Number(num) === 0)
      throw new Error("Cannot divide by zero");
    this.value = this.value.dividedBy(new Decimal(num));
    return this;
  }
  /**
   * round
   * @param decimalPlaces 数字或字符串
   * @returns Decimal
   */
  round(decimalPlaces = 2) {
    return this.value.toDecimalPlaces(decimalPlaces);
  }
}