44 lines
1017 B
JavaScript
44 lines
1017 B
JavaScript
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);
|
|
}
|