javascript - JS object sorting date sorting -

i have js object defined follows -

var item = {}; item[guid()] = {     symbol: $('#qtesymb').text(),     note: $('#newnote').val(),     date: $.datepicker.formatdate('mm/dd/yy', dt) + " " + dt.gethours() + ":" + minutes,     pagename: getpagename() }; 

at point in app getting list of (items) chrome.storage , able sort based on date

here doing

var sortable = [];              $.each(items, function (key, value) {                 if (value.symbol == $('#qtesymb').text() || all) {                                             sortable.push([key, value]);                 }             });              console.log(sortable);              sortable.sort(function (a, b) {                 = new date(a[1].date);                 b = new date(b[1].date);                 return > b ? -1 : < b ? 1 : 0;             });              console.log(sortable); 

it doesn't seem work. first , second console.log(sortable); same. have tried changing return > b ? -1 : < b ? 1 : 0; return < b ? -1 : > b ? 1 : 0; see if getting change sortable nothing happens... thank you~

both console.log show same array because when use console.log(sortable), sortable passed reference, , console output happens after finishing script - when sortable has been sorted.

making code simple:

var arr = [3,2,1]; console.log(arr); // produces `[1,2,3]` because printed                   // console after `arr.sort();` arr.sort(); console.log(arr); // produces `[1,2,3]`, expected 

demo: http://jsfiddle.net/rfwph/

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workaround

if want able console.log array see before being modifyed, can use .slice(0) copy array, i.e. obtain another array contains same elements array.

var arr = [3,2,1]; console.log(arr.slice(0)); // [3,2,1] arr.sort(); console.log(arr); // [1,2,3] 

demo: http://jsfiddle.net/rfwph/2/

edit: better use .slice(0) instead of .slice(), supported on ff ecma262 spec says end argument optional.