Question

I am trying to remap data using JavaScript

data[year].map(function(val1,index1){
    for(var prop in val1){
        if (plotdata[prop] === undefined)
            plotdata[prop] = new Array();
        if (plotdata[prop][year] === undefined)
            plotdata[prop][year] = new Array();
        plotdata[prop][year][index1] = val1[prop];
    }
});

data is an array with a key "2012".

plotdata is also an array.

data['2012'] contains 12 months, indexed from 0 to 11. I am trying to remap the data so I can access it like plotdata[property][year][month], but the problem is that plotdata is empty after the mapping.

I have checked and val1[prop] does indeed have a value. What could be the problem here?

Answer 1

Per the above comment-thread . . . this:

            plotdata[prop] = new Array();

should instead be this:

            plotdata[prop] = {};

because you want an associative array with years as keys, not a length-2,013 regular array.