function domainType(domains) {
    return domains.map(domain => {
        const domainNameComponents = domain.split('.');
        const TLD = domainNameComponents[domainNameComponents.length - 1]
        switch(TLD){
            case 'com':
                return 'commercial';
            case 'org':
                return 'organization';
            case 'net':
                return 'network';
            case 'info':
                return 'information';
        }
    })
}


/**
* 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"]);
    });
});