2-top-comments.js

var onError = (error) => this.sendError(error)
var byDate = (date1, date2) => new Date(date1.date) - new Date(date1.date)
var onlyTops = (comment) => comment.isTop()

var top10LatestComments = (rawData) => {
  app.topComments = rawData.data.comments
    .sort(byDate)
    .filter(onlyTops)
    .slice(0, 10)
}

var userId = 68
ajax(`/${userId}`, top10LatestComments, onError)

there is a typo in line2: should be "date2" instead of "date1" in the first(second?) occurence