What Am I Working On? (WAIWO)

waiwo.js

// Super simple access to your most recently interacted with GitHub repo

function fetch(route, callback) {
    // Ignoring old browsers...
    var request = new XMLHttpRequest();
    request.onreadystatechange = function() {
        if (request.readyState === 4)
            callback(request.responseText);
    }
    request.open('GET', route);
    request.send(null);
}

function mostRecentRepo(user, callback) {
    fetch("https://api.github.com/users/"+user+"/events", function(e) {
        var repo = JSON.parse(e)[0].repo;
        callback(repo);
    });
}

function displayMostRecentRepo(el, user) {
    mostRecentRepo(user, function(repo) {
        el.innerText = repo.name;
        if (el.tagName === "A")
            el.href = "https://github.com/" + repo.name;
    });
}

var someElement = document.getElementById("a");
var someUser = "wft";
displayMostRecentRepo(someElement, someUser);
// After a network call completes, someElement will be populated with
// the name of the repo someUser most recently worked on.
// If someElement is an anchor (<a></a>), it's href will point to
// the appropriate webpage.