ordering keys from Javascript object

Question

I saw this topic and the answers, but it doesn't seem to work for me. I tried alll variants of the values in the Object and sort, but it doesn't seem to work. I want to get a list ordered on the keys (not their values) in the objects (the, in this example 2 objects are in in a json):

d3.json:

{
"TEST1":    {"purchase": ["yes", 2], "safety": ["no", 3], "quality": ["Carried by the husk", 1], "name": ["Eggs!", 0]},
"TEST2":    {"purchase": "yes", "safety": "no", "quality": "Carried by the husk", "name": "0"}

}

And the JavaScript:

d3.json("d3.json", function(root) {

  for (key in root) {
      console.log(root[key]);
      var test = root[key];
      var list = Object.keys(test).sort(function(a,b){ return test[a]-test[b] })
      console.log(list);
  }
});

EDIT: Apologies, I wasn't clear on the expected results: I was looking for the keys sorted, but return with their values as the answer of dlopez did.

What are expected results?

charlietfl
– charlietfl

2016-05-28 22:31:33 +00:00
Commented May 28, 2016 at 22:31 — charlietfl
– charlietfl, Commented May 28, 2016 at 22:31
Good question, i edited :)

CorneeldH
– CorneeldH

2016-05-29 11:54:36 +00:00
Commented May 29, 2016 at 11:54 — CorneeldH
– CorneeldH, Commented May 29, 2016 at 11:54

dlopez · Accepted Answer · 2016-05-28 22:10:16Z

2

Try with this:

var sortedByKeys = Object.keys(root)
    .sort(function(a,b) { return a - b; })
    .reduce(function(prev, curr) {
        prev[curr] = root[curr];
        return prev;
    }, {});

answered May 28, 2016 at 22:10

dlopez

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1 Comment

CorneeldH Over a year ago

Thanks! Especially for interpreting the desired results :) In ended up needing an extra step (starting of with (for key in root), your code only sort the objects in the root, not the ones in root[key]) and I could leave out the sort-function (as stated by aromatt): for (key in root) { var sortedByKeys = Object.keys(root[key]) .sort() .reduce(function(prev, curr) { prev[curr] = root[key][curr]; return prev; }, {}); console.log(sortedByKeys); }

aromatt · Accepted Answer · 2016-05-28 22:15:49Z

1

You could simply usevar list = Object.keys(test).sort();

edited May 28, 2016 at 22:15

answered May 28, 2016 at 22:08

aromatt

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Comments

trincot · Accepted Answer · 2016-05-29 12:36:45Z

1

By using test[a] - test[b] in the sort call back function, you sort by the property values, not the keys. To sort by the keys you can use this:

  var list = Object.keys(test).sort(function(a,b){ return a.localeCompare(b) })

which is the default sorting order, so:

  var list = Object.keys(test).sort()

edited May 29, 2016 at 12:36

answered May 28, 2016 at 22:04

trincot

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