43 lines
1,017 B
JavaScript
43 lines
1,017 B
JavaScript
var iterate = require('./lib/iterate.js')
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, initState = require('./lib/state.js')
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, terminator = require('./lib/terminator.js')
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;
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// Public API
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module.exports = parallel;
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/**
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* Runs iterator over provided array elements in parallel
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*
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* @param {array|object} list - array or object (named list) to iterate over
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* @param {function} iterator - iterator to run
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* @param {function} callback - invoked when all elements processed
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* @returns {function} - jobs terminator
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*/
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function parallel(list, iterator, callback)
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{
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var state = initState(list);
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while (state.index < (state['keyedList'] || list).length)
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{
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iterate(list, iterator, state, function(error, result)
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{
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if (error)
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{
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callback(error, result);
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return;
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}
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// looks like it's the last one
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if (Object.keys(state.jobs).length === 0)
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{
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callback(null, state.results);
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return;
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}
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});
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state.index++;
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}
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return terminator.bind(state, callback);
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}
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