Mastering Immutable.js

Ordered intersections

You can preserve the order of the first set by transforming it to an ordered set:

const myOrderedIntersection = myFirstSet  .sort()  .intersect(mySecondSet);console.log('myOrderedIntersection', myOrderedIntersection.toJS());// -> myOrderedIntersection [ 2, 4, 6 ]

This works because myFirstSet is now an ordered set. When you sort it, it returns an OrderedSet which remains sorted when the intersect() method iterates over it.