parallel.js•1.02 kB
var iterate = require('./lib/iterate.js')
, initState = require('./lib/state.js')
, terminator = require('./lib/terminator.js')
;
// Public API
module.exports = parallel;
/**
* Runs iterator over provided array elements in parallel
*
* @param {array|object} list - array or object (named list) to iterate over
* @param {function} iterator - iterator to run
* @param {function} callback - invoked when all elements processed
* @returns {function} - jobs terminator
*/
function parallel(list, iterator, callback)
{
var state = initState(list);
while (state.index < (state['keyedList'] || list).length)
{
iterate(list, iterator, state, function(error, result)
{
if (error)
{
callback(error, result);
return;
}
// looks like it's the last one
if (Object.keys(state.jobs).length === 0)
{
callback(null, state.results);
return;
}
});
state.index++;
}
return terminator.bind(state, callback);
}