Sort Json Array with LoDash

Question

I have a JSON array whose general structure is like this:

var json = [ 
  { key: 'firstName', value: 'Bill' },
  { key: 'lastName',  value: 'Mans' },
  { key: 'phone', value: '123.456.7890' }
];

In reality, there will be a lot more key/value pairs. Either way, I'm trying to sort this array by the key value using Lodash. Currently, I'm trying the following:

_.map(_.sortBy(json, key), _.values);

However, that causes an error that says:

[ReferenceError: key is not defined]

I suspect its because key is not wrapped in quotes as shown in the docs. Unfortunately, I do not actually have control over the format of the json. In reality its being used by other developers and I'm the last to use it. Is there a way for me to sort the json array, by key names, using lodash? If so, how?

thank you

This is not JSON, look at how JSON should be formatted

ilyo
– ilyo

2014-10-01 06:49:07 +00:00
Commented Oct 1, 2014 at 6:49 — ilyo
– ilyo, Commented Oct 1, 2014 at 6:49

Stephen Thomas · Accepted Answer · 2014-04-30 19:31:46Z

16

You need to put the key in quotes only when calling sortBy. It doesn't have to be in quotes in the data itself.

_.sortBy(json, "key")

Also, your second parameter to map is wrong. It should be a function, but using pluck is easier.

_.pluck( _.sortBy(json, "key") , "value");

answered Apr 30, 2014 at 19:31

Stephen Thomas

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4 Comments

user3469584 Over a year ago

why is it when I do console.log(json) after the call, the JSON isn't sorted? What am I misunderstanding?

Stephen Thomas Over a year ago

functions? sortBy and pluck return values; neither operates on in-place data.

user3469584 Over a year ago

I must be missing something. I want to say json = _.sortBy(json, "key"); console.log(json); At that point, I need the results to be sorted. For some reason, they're still not sorted using the approach listed above.

RandomUser Over a year ago

@StephenThomas how can I re arrange the array json itself instead of pluck, meaning returning a sorted new array

Jeremy Moritz · Accepted Answer · 2016-03-28 15:49:03Z

4

_.map(_.sortBy(json, 'key'), 'value');

NOTE: In the latest version of lodash, _.pluck no longer exists. Use _.map instead as a drop-in replacement

answered Mar 28, 2016 at 15:49

Jeremy Moritz

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