RangedNumber, utility class used to store range of numbers and get random, or mid value easily

ranged_number.ts

/**
 * @example
 * // Example usage:
 * let rn = RangedNumber.fromString("1");
 * console.log(rn); // RangedNumber { min: 1, mid: 1, max: 1 }
 *
 * let rn = RangedNumber.fromString("1-2");
 * console.log(rn); // RangedNumber { min: 1, mid: 1.5, max: 2 }
 *
 * let randomNumber = rn.get();
 * console.log(randomNumber); // 1.94
 * console.log(rn.get()); // 1.55
 * console.log(rn.get()); // 1.98
 * console.log(rn.get()); // 1.7
 *
 * */
export class RangedNumber {
  min: number;
  max: number;
  mid: number;
  fix: number;

  constructor(min: number, max?: number, digitsAfterComma = 2) {
    max = max !== undefined ? max : min;
    RangedNumber.validate(min, max);
    this.min = min;
    this.mid = (min + max) / 2;
    this.max = max;
    this.fix = 10 ** digitsAfterComma;
  }

  static validate(min: number, max: number) {
    if (isNaN(min) || isNaN(max) || min > max) {
      throw new Error("RangedNumber invalid input data");
    }
  }

  static fromString(str: string): RangedNumber {
    let [min, max] = str.split("-").map(Number);
    max = max !== undefined ? max : min;
    RangedNumber.validate(min, max);
    return new RangedNumber(min, max);
  }

  get(): number {
    const num = Math.random() * (this.max - this.min) + this.min;
    return Math.round(num * this.fix) / this.fix;
  }
}