function differential()

in public/src/js/utils/sparklines.js [158:194]

• 32 lines of code
• 9 McCabe index (conditional complexity)

function differential (collection) {
    const front = collection.front;
    const storyPackage = front.collection ? front.collection() : null;
    const sparklines = storyPackage ? storyPackage.sparklines : null;

    if (!sparklines || !sparklines.resolved) {
        return;
    }

    const data = sparklines.data();
    const newArticles = [];
    collection.eachArticle(article => {
        const webUrl = getWebUrl(article);
        if (webUrl && !data[webUrl]) {
            newArticles.push(webUrl);
        }
    });

    if (newArticles.length) {
        const storyPackageId = front.front();

        sparklines.resolved = false;
        sparklines.promise = getHistogram(newArticles)
        .then(newData => {
            if (storyPackageId === front.front()) {
                _.each(newArticles, webUrl => {
                    data[webUrl] = newData[webUrl];
                });
                sparklines.data(data);
                sparklines.resolved = true;
                return data;
            }
        });

        return front.sparklines.promise;
    }
}