JSON.parse vs. unsafe eval (v4)

Revision 4 of this benchmark created by John-David Dalton on July 11, 2011

Description

Setup

var data =
   "{\"summary\":{\"turnover\":0.3736,\"correlation2\":0." +
   "7147,\"concentration\":0.3652,\"beta\":0.8814,\"totalValue\":1.3" +
   "091078259E8,\"correlation\":0.7217},\"watchlist\":[],\"shortCash" +
   "\":-1611000,\"holdings\":[{\"type\":\"LONG\",\"commission\":1040" +
   ",\"cost\":9001920,\"quantity\":26000,\"lots\":[{\"marketCap\":\"" +
   "L\",\"industry\":\"TECHNOLOGY\",\"style\":\"G\",\"buyDate\":\"20" +
   "08-10-08 13:44:20.000\",\"quantity\":8000},{\"marketCap\":\"L\"," +
   "\"industry\":\"TECHNOLOGY\",\"style\":\"G\",\"buyDate\":\"2008-1" +
   "0-15 13:28:02.000\",\"quantity\":18000}],\"stock\":\"GOOG\"},{\"" +
   "type\":\"LONG\",\"commission\":8000,\"cost\":4672000,\"quantity" +
   "\":200000,\"lots\":[{\"marketCap\":\"L\",\"industry\":\"TECHNOLO" +
   "GY\",\"style\":\"G\",\"buyDate\":\"2008-10-15 13:28:54.000\",\"q" +
   "uantity\":200000}],\"stock\":\"MSFT\"},{\"type\":\"LONG\",\"comm" +
   "ission\":21877,\"cost\":1.001592313E7,\"quantity\":546919,\"lots" +
   "\":[{\"marketCap\":\"L\",\"industry\":\"FINANCIAL\",\"style\":\"" +
   "G\",\"buyDate\":\"2008-08-01 09:50:17.000\",\"quantity\":103092}" +
   ",{\"marketCap\":\"L\",\"industry\":\"FINANCIAL\",\"style\":\"G\"" +
   ",\"buyDate\":\"2008-08-18 10:31:34.000\",\"quantity\":49950},{\"" +
   "marketCap\":\"L\",\"industry\":\"FINANCIAL\",\"style\":\"G\",\"b" +
   "uyDate\":\"2008-08-29 09:35:22.000\",\"quantity\":45045},{\"mark" +
   "etCap\":\"L\",\"industry\":\"FINANCIAL\",\"style\":\"G\",\"buyDa" +
   "te\":\"2008-09-15 09:40:32.000\",\"quantity\":48400},{\"marketCa" +
   "p\":\"L\",\"industry\":\"FINANCIAL\",\"style\":\"G\",\"buyDate\"" +
   ":\"2008-10-06 11:21:50.000\",\"quantity\":432},{\"marketCap\":\"" +
   "L\",\"industry\":\"FINANCIAL\",\"style\":\"G\",\"buyDate\":\"200" +
   "8-10-15 13:30:05.000\",\"quantity\":300000}],\"stock\":\"UBS\"}," +
   "{\"type\":\"LONG\",\"commission\":4000,\"cost\":6604849.1,\"quan" +
   "tity\":122741,\"lots\":[{\"marketCap\":\"L\",\"industry\":\"SERV" +
   "ICES\",\"style\":\"V\",\"buyDate\":\"2008-04-26 04:44:34.000\"," +
   "\"quantity\":22741},{\"marketCap\":\"L\",\"industry\":\"SERVICES" +
   "\",\"style\":\"V\",\"buyDate\":\"2008-10-15 13:31:02.000\",\"qua" +
   "ntity\":100000}],\"stock\":\"V\"},{\"type\":\"LONG\",\"commissio" +
   "n\":2805,\"cost\":5005558.25,\"quantity\":70121,\"lots\":[{\"mar" +
   "ketCap\":\"M\",\"industry\":\"RETAIL\",\"style\":\"G\",\"buyDate" +
   "\":\"2008-10-10 10:48:36.000\",\"quantity\":121},{\"marketCap\":" +
   "\"M\",\"industry\":\"RETAIL\",\"style\":\"G\",\"buyDate\":\"2008" +
   "-10-15 13:33:44.000\",\"quantity\":70000}],\"stock\":\"LDG\"},{" +
   "\"type\":\"LONG\",\"commission\":10000,\"cost\":5382500,\"quanti" +
   "ty\":250000,\"lots\":[{\"marketCap\":\"L\",\"industry\":\"RETAIL" +
   "\",\"style\":\"V\",\"buyDate\":\"2008-10-15 13:34:30.000\",\"qua" +
   "ntity\":250000}],\"stock\":\"SWY\"},{\"type\":\"LONG\",\"commiss" +
   "ion\":1120,\"cost\":1240960,\"quantity\":28000,\"lots\":[{\"mark" +
   "etCap\":\"u\",\"industry\":\"ETF\",\"style\":\"B\",\"buyDate\":" +
   "\"2008-10-15 15:57:39.000\",\"quantity\":28000}],\"stock\":\"OIL" +
   "\"},{\"type\":\"LONG\",\"commission\":400,\"cost\":236800,\"quan" +
   "tity\":10000,\"lots\":[{\"marketCap\":\"M\",\"industry\":\"UTILI" +
   "TIES_AND_ENERGY\",\"style\":\"G\",\"buyDate\":\"2008-10-15 15:58" +
   ":03.000\",\"quantity\":10000}],\"stock\":\"COG\"},{\"type\":\"LO" +
   "NG\",\"commission\":3200,\"cost\":1369600,\"quantity\":80000,\"l" +
   "ots\":[{\"marketCap\":\"S\",\"industry\":\"UTILITIES_AND_ENERGY" +
   "\",\"style\":\"G\",\"buyDate\":\"2008-10-15 15:58:32.000\",\"qua" +
   "ntity\":80000}],\"stock\":\"CRZO\"},{\"type\":\"LONG\",\"commiss" +
   "ion\":429,\"cost\":108164.8,\"quantity\":10720,\"lots\":[{\"mark" +
   "etCap\":\"u\",\"industry\":\"FINANCIAL\",\"style\":\"V\",\"buyDa" +
   "te\":\"2008-10-16 09:37:06.000\",\"quantity\":10720}],\"stock\":" +
   "\"FGI\"},{\"type\":\"LONG\",\"commission\":1080,\"cost\":494910," +
   "\"quantity\":27000,\"lots\":[{\"marketCap\":\"L\",\"industry\":" +
   "\"RETAIL\",\"style\":\"V\",\"buyDate\":\"2008-10-16 09:37:06.000" +
   "\",\"quantity\":27000}],\"stock\":\"LOW\"},{\"type\":\"LONG\",\"" +
   "commission\":4080,\"cost\":4867440,\"quantity\":102000,\"lots\":" +
   "[{\"marketCap\":\"L\",\"industry\":\"HEALTHCARE\",\"style\":\"V" +
   "\",\"buyDate\":\"2008-10-16 09:37:06.000\",\"quantity\":102000}]" +
   ",\"stock\":\"AMGN\"},{\"type\":\"SHORT\",\"commission\":4000,\"" +
   "cost\":-1159000,\"quantity\":-100000,\"lots\":[{\"marketCap\":" +
   "\"L\",\"industry\":\"TECHNOLOGY\",\"style\":\"V\",\"buyDate\":" +
   "\"2008-10-16 09:37:06.000\",\"quantity\":-100000}],\"stock\":\"" +
   "AMAT\"},{\"type\":\"LONG\",\"commission\":2,\"cost\":5640002,\"" +
   "quantity\":50,\"lots\":[{\"marketCap\":\"L\",\"industry\":\"FIN" +
   "ANCIAL\",\"style\":\"B\",\"buyDate\":\"2008-10-16 09:37:06.000" +
   "\",\"quantity\":50}],\"stock\":\"BRKA\"},{\"type\":\"SHORT\",\"" +
   "commission\":4000,\"cost\":-436000,\"quantity\":-100000,\"lots" +
   "\":[{\"marketCap\":\"M\",\"industry\":\"TRANSPORTATION\",\"styl" +
   "e\":\"G\",\"buyDate\":\"2008-10-16 09:37:06.000\",\"quantity\":-" +
   "100000}],\"stock\":\"JBLU\"},{\"type\":\"LONG\",\"commission\":8" +
   "000,\"cost\":1.1534E7,\"quantity\":200000,\"lots\":[{\"marketCap" +
   "\":\"S\",\"industry\":\"FINANCIAL\",\"style\":\"G\",\"buyDate\":" +
   "\"2008-10-16 14:35:24.000\",\"quantity\":200000}],\"stock\":\"US" +
   "O\"},{\"type\":\"LONG\",\"commission\":4000,\"cost\":1.0129E7,\"" +
   "quantity\":100000,\"lots\":[{\"marketCap\":\"L\",\"industry\":\"" +
   "TECHNOLOGY\",\"style\":\"G\",\"buyDate\":\"2008-10-15 13:28:26.0" +
   "00\",\"quantity\":50000},{\"marketCap\":\"L\",\"industry\":\"TEC" +
   "HNOLOGY\",\"style\":\"G\",\"buyDate\":\"2008-10-17 09:33:09.000" +
   "\",\"quantity\":50000}],\"stock\":\"AAPL\"},{\"type\":\"LONG\"," +
   "\"commission\":1868,\"cost\":9971367.2,\"quantity\":54280,\"lots" +
   "\":[{\"marketCap\":\"L\",\"industry\":\"SERVICES\",\"style\":\"G" +
   "\",\"buyDate\":\"2008-04-26 04:44:34.000\",\"quantity\":7580},{" +
   "\"marketCap\":\"L\",\"industry\":\"SERVICES\",\"style\":\"G\",\"" +
   "buyDate\":\"2008-05-29 09:50:28.000\",\"quantity\":7500},{\"mark" +
   "etCap\":\"L\",\"industry\":\"SERVICES\",\"style\":\"G\",\"buyDat" +
   "e\":\"2008-10-15 13:30:38.000\",\"quantity\":33000},{\"marketCap" +
   "\":\"L\",\"industry\":\"SERVICES\",\"style\":\"G\",\"buyDate\":" +
   "\"2008-10-17 09:33:09.000\",\"quantity\":6200}],\"stock\":\"MA\"" +
   "}],\"longCash\":4.600368106E7,\"ownerId\":8,\"pendingOrders\":[{" +
   "\"total\":487000,\"type\":\"cover\",\"subtotal\":483000,\"price" +
   "\":4.83,\"commission\":4000,\"date\":\"2008-10-17 23:56:06.000\"" +
   ",\"quantity\":100000,\"expires\":\"2008-10-20 16:00:00.000\",\"s" +
   "tock\":\"JBLU\",\"id\":182375},{\"total\":6271600,\"type\":\"buy" +
   "\",\"subtotal\":6270000,\"price\":156.75,\"commission\":1600,\"d" +
   "ate\":\"2008-10-17 23:56:40.000\",\"quantity\":40000,\"expires\"" +
   ":\"2008-10-20 16:00:00.000\",\"stock\":\"MA\",\"id\":182376}],\"" +
   "inceptionDate\":\"2008-04-26 04:44:29.000\",\"withdrawals\":0,\"" +
   "id\":219948,\"deposits\":";
  
  function isValid(s) {
    if (/^\s*$/.test(s)) {
      return false;
    }
    var backslashesRe = /\\["\\\/bfnrtu]/g;
    var openBracketsRe = /(?:^|:|,)(?:[\s\u2028\u2029]*\[)+/g;
    var remainderRe = /^[\],:{}\s\u2028\u2029]*$/;
    var simpleValuesRe = /"[^"\\\n\r\u2028\u2029\x00-\x08\x10-\x1f\x80-\x9f]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g;
  
    return remainderRe.test(s
      .replace(backslashesRe, '@')
      .replace(simpleValuesRe, ']')
      .replace(openBracketsRe, ''));
  }
  
  function jsonParse(s) {
    var o = String(s);
    if (isValid(o)) {
      try {
        return eval('(' + o + ')');
      } catch (e) { }
    }
    throw Error('Invalid JSON string: ' + o);
  }

  Benchmark.prototype.setup = function() {
    var i = 0;
    var data = window.data;
  };

Test runner

JSON.parse(data + (++i) + "}");

eval("(" + data + (++i) + "})");

jsonParse(data + (++i) + "}");

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.

• Revision 4: published by John-David Dalton on July 11, 2011