data types with daggy example.

daggy_example.js

const { taggedSum } = require('daggy');

const AuthenticationError = taggedSum(
  'AuthenticationError', 
  {
    AccountSuspended: [],
    InformationMismatch: [],
  }
);

const { AccountSuspended, InformationMismatch } = AuthenticationError;

function auth() {
  try {
     throw AccountSuspended;
  } catch(e) {
    AuthenticationError.is(e) && e.cata({
      AccountSuspended: () => console.log('your account is suspended'),
      InformationMismatch: () => console.log('login information is invalid'),
    });
  }
}