Static & Private Class Fields

What does making PRECISION private achieve?

class MathUtils {
  static #PRECISION = 2;
  
  static setRoundingPrecision(precision) {
    if (precision < 0 || precision > 20) {
      throw new Error('Invalid precision');
    }
    this.#PRECISION = precision;
  }
  
  static round(value) {
    return Number(value.toFixed(this.#PRECISION));
  }
}

Better performance
Memory optimization
Controlled precision changes
Private PRECISION provides controlled access: 1) Precision can only be changed through setRoundingPrecision method, 2) Validation can be enforced on precision changes, 3) Internal implementation details are hidden, 4) Prevents accidental precision modifications, 5) Maintains consistency across all calculations, 6) Enables future implementation changes without breaking code.
Automatic rounding

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