Sort a mutable list of objects in Kotlin

Question

There is a class name recording with parameters song, artist, and playtime

class Recording {
    var title: String
    var artists: String
    var playingTime: Int

    constructor(t: String, a: String, p: Int) {
        title = t
        artists = a
        playingTime = p
    }
}

I have a mutable list of objects,I need to sort this based on each parameter ie song, artist, and playtime.

 var list = mutableListOf<Recording>(
     Recording("Sorry", "Justin Bieber", 420),
     Recording("a", "a", 1),
     Recording("b", "b", 2)
 )

val sortedList = list.sortedWith(compareBy({ it.title.toLowerCase() }, { it.artists.toLowerCase() }, {it.playingTime})) — Raghunandan
– Raghunandan, Commented Jan 13, 2021 at 3:00

Codemaker2015 · Accepted Answer · 2021-01-13 03:04:25Z

1

You try it with either sortedWith or sortBy methods to sort a list of objects.

Method 1:

val result = list.sortedWith(compareBy({ it.title }, { it.artists }, {it.playingTime}))

Method 2:

val list1 = list.sortBy { it.title }
val list2 = list.sortBy { it.artists }
val list3 = list.sortBy { it.playingTime }

In the first method you will get a list of sorts lists and the second method will gives you the sorted results in different lists.

answered Jan 13, 2021 at 3:04

Codemaker2015

16k9 gold badges118 silver badges93 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Himanshu Choudhary Over a year ago

I think this will work fine for your case.

Collectives™ on Stack Overflow

Sort a mutable list of objects in Kotlin

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related