Sorting array of date objects javascript error
I am getting weird error, cannot figure it out. I have an array of date objects (AngularJS) and I want to sort them. I am doing as below
console.log(tempDates);
tempDates.sort( function(a, b) {
return a-b;
});
console.log(tempDates);
The problem is changing the tempDates array i.e. date values change. Wrong sorting function? / What am I missing?
original tempDates -
["Jun 19", "Jun 26", "Jul 3", "Jul 10", "Jul 17", "Jul 24", "Jul 31", "Aug 7", "Aug 14", "Aug 21", "Aug 28", "Sep 4", "Sep 11"]
after sorting,
["Jun 19", "Jun 26", "Jul 1", "Jul 3", "Jul 10", "Jul 17", "Jul 24", "Aug 7", "Aug 14", "Aug 21", "Aug 28", "Sep 4", "Sep 11"]
(Note that the array consists of DATE objects, the console output I put in is just readable)
The dates change as "Jul 1" appears out of nowhere and "Jul 31" is removed from the list. Any reason why this is happening?
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1 answer
You are sorting date objects, not numbers. To sort them as numbers, you will need to do something like this:
console.log(tempDates);
tempDates.sort( function(a, b) {
return a.getTime() - b.getTime();
});
console.log(tempDates);
.getTime () converts the string representation of a date to an actual number. (Milliseconds since 1970/01/01)
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