text: 'use strict';
  
  const ages = new Map();
  
  ages.set('Vasia Pupkin', 19);
  ages.set('Marcus Aurelius', 1860);
  console.log({ ages });
  
  ages.set('Vasia Pupkin', 20);
  console.log({ ages });
  
  ages.delete('Vasia Pupkin');
  console.log({ ages });
  
  console.log({
    'Vasia Pupkin': ages.has('Vasia Pupkin'),
    'Marcus Aurelius': ages.has('Marcus Aurelius'),
  });
  
  ages.clear();
  console.log({ ages });
  