words_per_chapter_24_hours.js

window.chapters = [];
var startTime = new Date('2012-06-11T11:10:00+10:00');
var processedChapters = 0;

// Loop through each of the nine chapters
for (var chapter = 0; chapter < 9; chapter++) {
  // set up each chapter as an empty array to populate with the number of words
  chapters[chapter] = [];

  // Get the JSON data for the chapter’s versions
  $.getJSON("/chapters/" + (chapter + 1) + "/versions", (function(chapter) {
    return function(data) {
      // Loop through 24 hours in 10 minute intervals
      for (var interval = 0; interval < 144; interval++) {
        var time = new Date(startTime);
        time.setMinutes(startTime.getMinutes() + interval * 10);
        // Find all versions before this time
        var versions = $.grep(data.chapter_versions, function(version) {
          return (new Date(version.created_at) < time);
        });
        // Select the newest version
        var lastestVersion = versions[versions.length - 1];
        var numWords = 0;
        // Extract the number of words for the version (if there is one)
        if (typeof lastestVersion !== "undefined") {
          numWords = lastestVersion.text_analysis.num_words;
        }
        // Push the value to the chapter’s array
        chapters[chapter].push(numWords);
      }
      // Because $.getJSON is async we need a way to tell when everything is done
      processedChapters++;
      if (processedChapters == 9) {
        console.log('All data processed and saved to window.data');
        console.log(window.chapters);
      }
    };
  // Wrap in closure so the chapter variable stays correct
  })(chapter));
}