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(typeof sampleActivity === "string" && typeof +sampleActivity === "number" && +sampleActivity > 0 && +sampleActivity < MODERN_ACTIVITY) {
      return Math.ceil(Math.log(MODERN_ACTIVITY/(+sampleActivity))/ (Math.log(2).toFixed(6)/HALF_LIFE_PERIOD));
    } else {
      return false;
    }
  }
  