Javascript: Coeval counter

JS: Functions
Last update: 13 Sep 23:15
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users.js

Implement and export as default a function that takes a list of users and returns an object where the key is the birth year and the value is the number of men born that year.

Examples

const users = [
  { name: 'Bronn', gender: 'male', birthday: '1973-03-23' },
  { name: 'Reigar', gender: 'male', birthday: '1973-11-03' },
  { name: 'Eiegon', gender: 'male', birthday: '1963-11-03' },
  { name: 'Sansa', gender: 'female', birthday: '2012-11-03' },
  { name: 'Jon', gender: 'male', birthday: '1980-11-03' },
  { name: 'Robb', gender: 'male', birthday: '1980-05-14' },
  { name: 'Tisha', gender: 'female', birthday: '2012-11-03' },
  { name: 'Rick', gender: 'male', birthday: '2012-11-03' },
  { name: 'Joffrey', gender: 'male', birthday: '1999-11-03' },
  { name: 'Edd', gender: 'male', birthday: '1973-11-03' },
];

getMenCountByYear(users);
// {
//   1973: 3,
//   1963: 1,
//   1980: 2,
//   2012: 1,
//   1999: 1,
// };

Tips

  • To extract the year from a date use the slice method

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