Lodash : how to do a case insensitive sorting on a collection using orderBy?

Question

I checked this answer but to achieve the same result, that is to get case-insensitive sorting, I need to use orderBy instead of sortBy since it gives the ability to specify the sort order.

The only way I found to achieve it was to create a cloned "middle" array mapped to lower case the name :

const users = [   { name: 'A', age: 48 },   { name: 'B', age: 34 },   { name: 'b', age: 40 },   { name: 'a', age: 36 } ];  let lowerCaseUsers = _.clone(users);  lowerCaseUsers = lowerCaseUsers.map((user) => {   user.name = user.name.toLowerCase();   return user; });  const sortedUsers = _.orderBy(lowerCaseUsers, ['name'], ['desc']);  console.log(sortedUsers); 

This seems really expensive and it will even be more complex with multiple sortings and dynamic properties names.

Is there a better idea ?

---

Here is a Plunker : https://plnkr.co/edit/i1ywyxjFctuNfHtPTcgG

Answer 1

The documentation specifies that you can pass a function as "iteratee":

[iteratees=[_.identity]] (Array[]|Function[]|Object[]|string[]): The iteratees to sort by.

So you can do

const users = [    { name: 'A', age: 48 },    { name: 'B', age: 34 },    { name: 'b', age: 40 },    { name: 'a', age: 36 }  ];    const sortedUsers = _.orderBy(users, [user => user.name.toLowerCase()], ['desc']);  console.log(sortedUsers);

<script src="https://cdn.jsdelivr.net/lodash/4.13.1/lodash.min.js"></script>