Method toNumber

src/utils.ts:372–374

* Convert a string value to a number, handling null and empty strings. * * @param value string or null value to convert * @returns number value, or undefined for null/empty strings * * @example * Utils.toNumber('42'); // 42 * Utils.toNumber(''); // undefined * Utils.toNum

(value: null | string)

   * Utils.toNumber(null);  // undefined
   */
  static toNumber(value: null | string): number {
    return (value === null || value.length === 0) ? undefined : Number(value);
  }

  /**
   * Parse a height value with units into numeric value and unit string.