Splitting world's biggest urban area between rich and poor to compute a sum of those population.

richvspoorurbanareas.js

// Run me on http://en.wikipedia.org/wiki/List_of_metropolitan_areas_by_population

// from http://stackoverflow.com/questions/298750/how-do-i-select-text-nodes-with-jquery
var getTextNodesIn = function($el) {
    return $($el.find(":not(iframe)").addBack().contents().filter(function() {
        return this.nodeType == 3;
    }).get(0)).text();
};

var rowsSelector = '#bodyContent .sortable.wikitable.jquery-tablesorter tr',
  $rows = $(rowsSelector),
  cityNameSelector = 'td:eq(0) a',
  cityPopSelector = 'td:eq(4)',
  cityAltPopSelector = 'td:eq(3)',
  cityCountrySelector = 'td:eq(1) a',
  citiesData = [],
  richCountries = ['United States', 'France', 'South Korea', 'Italy', 'Spain', 'Germany',
                  'United Kingdom', 'Japan', 'Russia', 'Singapore'],
  richSum = 0,
  poorSum = 0;
  


$rows.each(function(_, item) {
  var $item = $(item),
    name = getTextNodesIn($item.find(cityNameSelector)),
    $pop = $item.find(cityPopSelector),
    pop = getTextNodesIn($pop).replace(/,/g, ''),
    validPop = !(typeof(pop) === 'undefined') && (pop !== ''); 
  if (!validPop) {
    $pop = $item.find(cityAltPopSelector),
    pop = getTextNodesIn($pop).replace(/,/g, ''),
    validPop = !(typeof(pop) === 'undefined') && (pop !== ''); 
  }
  
  if (!validPop) {
    return true;
  }
  
  var $country = $item.find(cityCountrySelector),
    country = $country.attr('title'),
    validCountry = !(typeof(country) === 'undefined') && (country !== ''); 

  if (!validCountry) {
    return true; 
  }
  
  if (richCountries.indexOf(country) !== -1) {
    richSum += new Number(pop);
  } else {
    poorSum += new Number(pop);
    console.log(country);
  }
      
  
  var cityData = { 
    name: name,
    pop: pop,
    country: country,
  };
  citiesData.push(cityData);  
});

console.log(richSum);
console.log(poorSum);