Mastering Immutable.js

Sorting sets

You can use ordered sets to remove duplicate values and maintain the value insertion order. This means that you can do things such as converting a list to an ordered set, sorting the set, and then converting it back to a list. Examine the following:

const myList = List.of(  1, 3, 1, 2, 3, 4, 1, 5,  2, 4, 6, 1, 5, 2, 7, 1,  8, 3, 7, 1, 4, 2, 8, 9);const myUniqueList = myList  .toOrderedSet()  .sort()  .reverse()  .toList();console.log('myList', myList.toJS());// -> myList [ 1, 3, 1, 2, 3, 4, 1, 5, 2, 4, 6,// ->          1, 5, 2, 7, 1, 8, 3, 7, 1, 4, 2,// ->          8, 9 ]console.log('myUniqueList', myUniqueList.toJS());// -> myUniqueList [ 9, 8, 7, 6, 5,// ->                4, 3, 2, 1 ]

The key here is that the list is converted to an ordered set before any sorting ...