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parallel.js (1017B)


      1 var iterate    = require('./lib/iterate.js')
      2   , initState  = require('./lib/state.js')
      3   , terminator = require('./lib/terminator.js')
      4   ;
      5 
      6 // Public API
      7 module.exports = parallel;
      8 
      9 /**
     10  * Runs iterator over provided array elements in parallel
     11  *
     12  * @param   {array|object} list - array or object (named list) to iterate over
     13  * @param   {function} iterator - iterator to run
     14  * @param   {function} callback - invoked when all elements processed
     15  * @returns {function} - jobs terminator
     16  */
     17 function parallel(list, iterator, callback)
     18 {
     19   var state = initState(list);
     20 
     21   while (state.index < (state['keyedList'] || list).length)
     22   {
     23     iterate(list, iterator, state, function(error, result)
     24     {
     25       if (error)
     26       {
     27         callback(error, result);
     28         return;
     29       }
     30 
     31       // looks like it's the last one
     32       if (Object.keys(state.jobs).length === 0)
     33       {
     34         callback(null, state.results);
     35         return;
     36       }
     37     });
     38 
     39     state.index++;
     40   }
     41 
     42   return terminator.bind(state, callback);
     43 }