state.js (941B)
1 // API 2 module.exports = state; 3 4 /** 5 * Creates initial state object 6 * for iteration over list 7 * 8 * @param {array|object} list - list to iterate over 9 * @param {function|null} sortMethod - function to use for keys sort, 10 * or `null` to keep them as is 11 * @returns {object} - initial state object 12 */ 13 function state(list, sortMethod) 14 { 15 var isNamedList = !Array.isArray(list) 16 , initState = 17 { 18 index : 0, 19 keyedList: isNamedList || sortMethod ? Object.keys(list) : null, 20 jobs : {}, 21 results : isNamedList ? {} : [], 22 size : isNamedList ? Object.keys(list).length : list.length 23 } 24 ; 25 26 if (sortMethod) 27 { 28 // sort array keys based on it's values 29 // sort object's keys just on own merit 30 initState.keyedList.sort(isNamedList ? sortMethod : function(a, b) 31 { 32 return sortMethod(list[a], list[b]); 33 }); 34 } 35 36 return initState; 37 }