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How to add more property key value instead of overwriting in javascript

I am trying to create an archive system from google blogger api. I have the data as json of all posts from the blogger. Here is my code that I have tried. 

var archive= {};
if("entry" in TotalFeed.feed) 
{
    var PostEntries=TotalFeed.feed.entry.length;
    for(var PostNum=0; PostNum<PostEntries ; PostNum++) 
    {
        var ThisPost = TotalFeed.feed.entry[PostNum];
        var key=ThisPost.published.$t.substring(0,4);
        var MonthNames=["January","February","March","April","May","June","July","August","September","October","November","December"];

        var m=ThisPost.published.$t.substring(5,7);
        var NameOfMonth = MonthNames[parseInt(m)-1];

         archive[key] = {
            [NameOfMonth]: 1
         }
    }
}
console.log(archive);

The result of this code is 

2011:{May: "1"},
2012:{January: "1"},
2013:{January: "1"}

There are many months in 2011 but you can see it only overwrite the last one. So I only get last month of the year from the loop. How can I get all the months listed?

Any idea or help is highly appreciated. Thank you.

Edit: Key is not same, Here is a picture of the log enter image description here

Solution

  • You need a deeper object and you are also not checking if archive[key] already exists so you overwrite it if it does.

    Try something like

    // existing year object or create it
archive[key] = archive[key] || {};
//existing month array or create it
archive[key][NameOfMonth] = archive[key][NameOfMonth] || [];
// push item to appropriate month array
archive[key][NameOfMonth].push(ThisPost)

    Or just to count year/month entries:

    // existing year object or create it
archive[key] = archive[key] || {};
//existing month property or create it then increment count
archive[key][NameOfMonth] = (archive[key][NameOfMonth] || 0) +1;