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76 lines
1.7 KiB
76 lines
1.7 KiB
4 years ago
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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 = serialOrdered;
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// sorting helpers
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module.exports.ascending = ascending;
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module.exports.descending = descending;
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/**
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* Runs iterator over provided sorted array elements in series
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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} sortMethod - custom sort function
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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 serialOrdered(list, iterator, sortMethod, callback)
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{
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var state = initState(list, sortMethod);
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iterate(list, iterator, state, function iteratorHandler(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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state.index++;
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// are we there yet?
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if (state.index < (state['keyedList'] || list).length)
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{
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iterate(list, iterator, state, iteratorHandler);
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return;
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}
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// done here
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callback(null, state.results);
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});
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return terminator.bind(state, callback);
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}
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/*
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* -- Sort methods
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*/
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/**
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* sort helper to sort array elements in ascending order
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*
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* @param {mixed} a - an item to compare
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* @param {mixed} b - an item to compare
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* @returns {number} - comparison result
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*/
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function ascending(a, b)
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{
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return a < b ? -1 : a > b ? 1 : 0;
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}
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/**
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* sort helper to sort array elements in descending order
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*
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* @param {mixed} a - an item to compare
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* @param {mixed} b - an item to compare
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* @returns {number} - comparison result
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*/
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function descending(a, b)
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{
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return -1 * ascending(a, b);
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}
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