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function countWordsInText(text) {
    let count = {};
    let popularity = [];  // maybe this should be an object due to JS array expansion logic

    function updateWord(word, ct) {
        if (popularity[ct-1]) {
            popularity[ct-1].delete(word);
        }
        if (!popularity[ct]) {
            popularity[ct] = new Set();

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function doThingThatAcceptsCallback(arg1, callback) {
    doThingThatReturnsAPromise(arg1)
    .then(function resolved(result) {
        callback(null, result);
    })
    .catch(function rejected(error) {
        callback(error);
    });
}

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function doThingThatReturnsPromise(arg1) {
    return new Promise(function(resolve, reject) {
        fnThatDoesTheThingButAcceptsACallback(arg1, function callback(err, result) {
            if(err) {
                // the callback was called with an error
                return reject(err);
            }
            // the callback was called with a result
            resolve(result);
        });

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def logDeferredTime(deferred, logfn, message, extra=None):
    """Returns a deferred that wraps the passed in deferred and logs how long
    it took for the provided deferred to return (either callback or errback)
    from the time of the calling of this function. This creates a proxy
    Deferred that is passed all of the arguments that are passed to the
    provided deferred.

    deferred: The deferred that we wish to time.
    logfn: A function that is called with (message, extra=extra). IE.
           `logger.info`