Sort array by date in underscore.js

Question

I am using Coffescript, underscore.js, knockout, and I am trying to sort an array by date, but for some reason its not working

let accounts = [
  {
    id: 101,
    content: "abc1",
    createdDate: "2015-12-22T00:00:00"
  },
  {
    id: 102,
    content: "abc2",
    createdDate: "2012-12-22T00:00:00"
  }

]

This is how I wrote the code in coffeescript

_.sortBy(accounts, (a) ->  a.createdDate)

The same generated code in JS

return this.accounts(_.sortBy(accounts, function(a) {
      return a.createdDate;
    }));

Please let me know where I am going wrong. I am not getting any error, but the array is not getting sorted by date.

Tamas Szoke · Accepted Answer · 2020-04-09 17:57:01Z

1

Your JSON syntax is invalid and there's no createdDate property, it should be like:

accounts = [
  {
    id: 102,
    content: "abc",
    createdDate: "2015-12-22T00:00:00"
  }
]

So you can use a function as you wrote (use => instead of ->).

Working example:

let accounts = [
  {
    id: 101,
    content: "abc1",
    createdDate: "2015-12-22T00:00:00"
  },
  {
    id: 102,
    content: "abc2",
    createdDate: "2012-12-22T00:00:00"
  },
  {
    id: 103,
    content: "abc3",
    createdDate: "2018-12-22T00:00:00"
  }
]

accounts = _.sortBy(accounts, (a) =>  a.createdDate)
console.log(accounts)

<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.9.1/underscore.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.2/knockout-min.js"></script>

Of course, the id and the content is just an example.

edited Apr 9, 2020 at 17:57

answered Apr 9, 2020 at 17:33

Tamas Szoke

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6 Comments

Techno Over a year ago

The data I gave was just an example. I am getting my data from an object, the JSon is like this { id: 101, content: "abc", createdDate: "2015-12-22T00:00:00" }

Tamas Szoke Over a year ago

Ok, then I think the only problem is the - sign instead of the =, check the updated answer.

Techno Over a year ago

Yes I tried this, I put '=' instead of '-', still not working.

Tamas Szoke Over a year ago

Please include the exact problem and error message in the question.

caffeinated.tech Over a year ago

@Techno Are you assigning the result of sortBy back to the original array? sortBy does not mutate the original array. @Tamas is doing it in their answer, but you might have missed it: accounts = _.sortBy(accounts, (a) => a.createdDate)

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