function domainType(domains) {
    domainTypes = [];
    
    for (domain of domains) {
        switch (domain[domain.length - 1].toLowerCase()) {
            case 'g':
                domainTypes.push('organization');
                break;
            case 'm':
                domainTypes.push('commercial');
                break;
            case 't':
                domainTypes.push('network');
                break;
            case 'o':
                domainTypes.push('information');
                break;
            default:
                throw 'invalid domain'
        }
    }
    
    return domainTypes;
}



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