Kotlin Programming Cookbook

How to do it…

Now, let's follow these steps to sort based on multiple fields of an object:

1. First, let's create the Student class:

class Student(val age:Int, val GPA: Double)

2. Then, create a list of Student objects:

val studentA=Student(11,2.0)val studentB=Student(11,2.1)val studentC=Student(11,1.3)val studentD=Student(12,1.3)val studentsList=listOf<Student>(studentA,studentB,studentC,studentD)

3. To sort it on multiple fields, we simply need to do this:

val sortedList=studentsList.sortedWith(compareBy({it.age},{it.GPA}))

4. If we print it now, we will get the following output:

sortedList.forEach {    println("age: ${it.age}, GPA: ${it.GPA} ")}//Output: age: 11, GPA: 1.3           age: 11, GPA: 2.0           age: 11, GPA: 2.1           age: 12, GPA: 1.3