How to sort object by key through JSON file parsing in D3.js [duplicate]

Question

I have a JSON file (myfile.json) that looks like this:

{"3":["c","d"], "3.5":["j","k"], "1.5":["a","b"], "2.5":["x","y"] }

What I want to do open the file and sort it using d3.js file opening.

 d3.json('myfile.json',function(err,datafull){ for (var myval in datafull) { console.log(myval); } });

Now if I do that, the console.log will print they key in unsorted manner. How can I sort the file?

This is different question, because it involves file parsing.

Put each item into an array and then sort the array. Or use Object.keys() to get an array of the keys, sort that array, then use it to access the properties of the original object in sorted order. But you can't sort a (non-array) object. — nnnnnn
– nnnnnn, Commented Sep 16, 2015 at 0:29

sjm · Accepted Answer · 2015-09-16 01:06:22Z

2

To sort object keys you can use Object.keys() method which gives an array of the given objects keys then you can use the array sort() method.

d3.json('myfile.json',function(err,data){ keys = Object.keys(data), i, len = keys.length; keys.sort(function(a, b) { return a - b; }); for (i = 0; i < len; i++) { var a = keys[i]; console.log(a + ':' + data[a]); } }

See http://jsfiddle.net/sjmcpherso/mvrWb/234/