function domainType(domains) {
    let domainTypes = [];
    // for each url, split string by "."
    for (let i=0; i<domains.length; i++){
        const domainArr = domains[i].split(".");
        // map domain abbr (last element) to full string
        switch (domainArr[domainArr.length - 1]) {
            case "org": 
                domainTypes.push("organization");
                break;
            case "com": 
                domainTypes.push("commercial")
                break;
            case "net": 
                domainTypes.push("network")
                break;
            case "info": 
                domainTypes.push("information")
                break;
            default: 
                domainTypes.push("unknown")
        }
    }
    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"]);
    });
});