Scala collections provide you three options for sorting: sorted( ), sortWith( ) and sortBy( ). Here is a simplified explanation:
Will sort the list using the natural ordering (based on the implicit Ordering passed)
sortBy (an attribute)
Sort by a given attribute using the attribute's type.
e.g. given a list of Person objects, if you want to sort them in ascending order of their age (which is an Int), you could simply say: personList.sortBy(_.age)
sortWith (a function)
Takes a comparator function. Useful when you want to specify a custom sorting logic.
e.g. if you want to sort by age descending, you could write this as:
leftE.age > rightE.age
Or, more simply: personList.sortWith(_.age > _.age)
Checkout this gist for a full example: