Extract Reddit page stats from the Browser console

browserconsole-reddit-page_stats.js

////////////////////////////////////////////////////////////////////////////////
//
// The MIT License (MIT)
//
// Copyright (c) 2016 Samuel Ortiz Reina (@iamsortiz)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//
////////////////////////////////////////////////////////////////////////////////

//from: http://stackoverflow.com/questions/9716468/is-there-any-function-like-isnumeric-in-javascript-to-validate-numbers
function isNumeric(n) {
  return !isNaN(parseFloat(n)) && isFinite(n);
}

/**
 * Extract aggregated data from target element attributes
 *
 * @param  {CSS selector} selector  target elements selector
 * @param  {function} extractor return target text from JQuery element
 * @return {object} max and average occurences
 */
function extractStatsFor(selector, extractor) {
  var sum = 0;
  var count = 0;
  var max = 0;

  //For each target element
  $(selector).each(function () {

    //Get target text
    var text = extractor($(this));

    //Extract agregate stats
    if (isNumeric(text)) {
      var number = parseInt(text);
      if (number > max) max = number;
      sum += number;
      count++;
    }
  });
  var average = sum / count;

  var stats = {
    max: max,
    average: average
  };

  return stats;
}

/**
 * Extract stats for multiple criteria
 */
function extractStats() {
  var votes_selector = '.score.unvoted';
  var votes_extractor = function (element) {
    return element.text();
  };
  var votes = extractStatsFor(votes_selector, votes_extractor);

  var comments_selector = '.comments';
  var comments_extractor = function (element) {
    return (element.text().split(' '))[0];
  };
  var comments = extractStatsFor(comments_selector, comments_extractor);

  var stats = {
    id: window.location.href,
    votes: votes,
    comments: comments
  };

  console.log(JSON.stringify(stats, null, 2));

  return stats;
}

extractStats();