function domainType(domains) {
    //  write code here.
    let domains_mapping = {
        'com': 'commercial',
        'org': 'organization',
        'net': 'network',
        'info': 'information'
    }

    let results = []
    for (let domain of domains) {
        domain = domain.split('.')
        domain = domain[domain.length - 1]
        results.push(domains_mapping[domain])
    }

    return results
}

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