Sorting an array of object by value in a specific order based on another object for D3 Visualization

Question

I have an array of object containing colors. I need to sort the array by the color in a specific order.

I used the answer from stackoverflow to sort the array in a specific order and it has mostly worked. The issue that I face right now is that when I visualise it using D3Js, instead of clubbing all the objects with matching colors together there is repetition of the colors in specified order. Why is this happening and how can I get the correct sorting.

    var sortOrder = {"#F39849": 0, "#E94927": 1, "#538296": 2, "#CCCCCC": 3};

    var sortedData = data.sort(function (p1, p2) {
      return sortOrder[p1.colors] - sortOrder[p2.colors];
    });

full code is here

Scott Sauyet · Accepted Answer · 2019-05-19 14:35:45Z

0

I'm guessing that this has to do with the values in your data that are don't have colors attributes. There are at least a few of them I see.

If you had some handling for unknown values, say

    var sortOrder = {"#F39849": 0, "#E94927": 1, "#538296": 2, "#CCCCCC": 3, "unknown" : 100};

and

    return sortOrder[p1.colors || 'unknown'] - sortOrder[p2.colors || 'unknown'];

It will likely work.

You might also want to handle the case where colors is found, but is not in your list, which probably can be handled with

return ((sortOrder[p1.colors || 'unknown'] + 1) || Infinity) - 
       ((sortOrder[p2.colors || 'unknown'] + 1) || Infinity);

The Infinitys are to move any not found to the end of the list, and we need to +1s to avoid doing 0 || Infinity.

answered May 19, 2019 at 14:35

Scott Sauyet

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