Function isCyclic

javascript/0207-course-schedule.js:41–49

(currCourse, graph, path)

};

var isCyclic = (currCourse, graph, path) => {
    const hasSeen = path[currCourse];
    if (hasSeen) return true;

    const isMissingNext = !(currCourse in graph);
    if (isMissingNext) return false;

    return backTrack(currCourse, graph, path);
};

var backTrack = (currCourse, graph, path) => {
    path[currCourse] = true;