function domainType(domains) {
    let domainTypes = [];
    for (let i = 0; i < domains.length; i++) {
        let domain = domains[i];
        let topLevelDomain = domain.substr(domain.lastIndexOf(".") + 1);

        switch(topLevelDomain) {
            case "com":
                domainTypes.push("commercial");
                break;
            case "org":
                domainTypes.push("organization");
                break;
            case "net":
                domainTypes.push("network");
                break;
            case "info":
                domainTypes.push("information");
                break;
            default:
                break;
        }
        
    }
    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"]);
    });
});