twitst4tz

twitter statistics web application
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state.js (941B)

      1 // API
      2 module.exports = state;
      3 
      4 /**
      5  * Creates initial state object
      6  * for iteration over list
      7  *
      8  * @param   {array|object} list - list to iterate over
      9  * @param   {function|null} sortMethod - function to use for keys sort,
     10  *                                     or `null` to keep them as is
     11  * @returns {object} - initial state object
     12  */
     13 function state(list, sortMethod)
     14 {
     15   var isNamedList = !Array.isArray(list)
     16     , initState =
     17     {
     18       index    : 0,
     19       keyedList: isNamedList || sortMethod ? Object.keys(list) : null,
     20       jobs     : {},
     21       results  : isNamedList ? {} : [],
     22       size     : isNamedList ? Object.keys(list).length : list.length
     23     }
     24     ;
     25 
     26   if (sortMethod)
     27   {
     28     // sort array keys based on it's values
     29     // sort object's keys just on own merit
     30     initState.keyedList.sort(isNamedList ? sortMethod : function(a, b)
     31     {
     32       return sortMethod(list[a], list[b]);
     33     });
     34   }
     35 
     36   return initState;
     37 }