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38 lines
941 B
JavaScript
38 lines
941 B
JavaScript
6 years ago
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// API
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module.exports = state;
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/**
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* Creates initial state object
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* for iteration over list
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*
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* @param {array|object} list - list to iterate over
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* @param {function|null} sortMethod - function to use for keys sort,
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* or `null` to keep them as is
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* @returns {object} - initial state object
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*/
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function state(list, sortMethod)
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{
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var isNamedList = !Array.isArray(list)
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, initState =
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{
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index : 0,
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keyedList: isNamedList || sortMethod ? Object.keys(list) : null,
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jobs : {},
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results : isNamedList ? {} : [],
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size : isNamedList ? Object.keys(list).length : list.length
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}
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;
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if (sortMethod)
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{
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// sort array keys based on it's values
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// sort object's keys just on own merit
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initState.keyedList.sort(isNamedList ? sortMethod : function(a, b)
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{
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return sortMethod(list[a], list[b]);
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});
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}
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return initState;
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}
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