function domainType(domains) {
    const types = new Map([
        ['org', 'organization'],
        ['com', 'commercial'],
        ['net', 'network'],
        ['info', 'information'],
    ]);

    return domains.map((domain) => {
        const tld = domain.split('.').pop().toLowerCase();
        return types.has(tld) ? types.get(tld) : 'unknown';
    });
}



/**
* Test Suite 
*/
describe('domainType()', () => {
    it('returns list of domain types', () => {
        // arrange
        const domains = ["en.wiki.org", "codefights.com", "happy.net", "code.info"];
        
        // act
        const result = domainType(domains);

        // log
        console.log("result: ", result);
        
        // assert
        expect(result).toEqual(["organization", "commercial", "network", "information"]);
    });
});