javascript- Not outputting the result on console (level beginner)

Question

var languages = {
    english: "Hello!",
    french: "Bonjour!",
    notALanguage: 4,
    spanish: "Hola!"
};

for (var x in languages)
{
    if(typeof(languages.x)=="string")
    {
        console.log(languages.x);
    }
}

Output should be- Hello! Bonjour! Hola! But there is nothing on the console screen. (There is no syntactical error so maybe there is some logical error)
P.S. It's 27/30 exercise on www.codecademy.com (Last chapter)