text: import { NotImplementedError } from '../extensions/index.js';
  
  const MODERN_ACTIVITY = 15;
  const HALF_LIFE_PERIOD = 5730;
  
  /**
   * Determine the age of archeological find by using
   * given MODERN_ACTIVITY and HALF_LIFE_PERIOD values
   *
   * @param {String} sampleActivity string representation of current activity
   * @return {Number | Boolean} calculated age in years or false
   * in case of incorrect sampleActivity
   *
   * @example
   *
   * dateSample('1') => 22387
   * dateSample('WOOT!') => false
   *
   */
  export default function dateSample(sampleActivity) {
    if (arguments.length === 0 || isNaN(+sampleActivity) || typeof sampleActivity != 'string' || sampleActivity > 15 || sampleActivity <= 0) return false;
    return Math.abs(Math.floor((Math.log(sampleActivity / MODERN_ACTIVITY) * HALF_LIFE_PERIOD) / Math.LN2));
  }
  