Get Item between ranges of list kotlin

Question

Hey I have list of int type for example. I want to pass startingIndex and endingIndex to get between items of that range in list. So How can I do this in efficient way in Kotlin.

val list = mutableListOf(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)

For example

Scenario 1

startingIndex = 2, endingIndex = 6

List will returns items

Expected Output

3, 4, 5, 6, 7

Scenario 2

startingIndex = 0, endingIndex = 2

List will returns items

1, 2, 3

Thanks in advance.

Madhu Bhat · Accepted Answer · 2021-10-19T15:23:04.333

9

You can use Kotlin's slice function to get a part of the list by passing the range of indices.

val list = mutableListOf(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)

println(list.slice(2..6)) //prints [3, 4, 5, 6, 7]

println(list.slice(0..2)) //prints [1, 2, 3]

For any collection related operations, the best way to find out would be to check Kotlin's documentation for collections, as a lot of operations are supported by Kotlin's standard library by default.

edited Oct 19 '21 at 15:23

answered Oct 19 '21 at 15:19

Madhu Bhat

13,559
2
38
54

thanks for reply. `slice` will not modify the original list? – Kotlin Learner Oct 19 '21 at 15:21
No, it would not modify the list. – Madhu Bhat Oct 19 '21 at 15:27
@vivekmodi No, it won't… – deHaar Oct 19 '21 at 15:28
is there any slice similar but can modify the original list? – Amos Aug 14 '22 at 03:07
seems removeRange is abstract and need to self-implemented, but found a trick here: https://stackoverflow.com/a/56903283/3260008 – Amos Aug 14 '22 at 04:15

score 1 · Answer 2 · edited Feb 16 '23 at 15:19

1

Here you can use List.subList(a, b) method. It takes two parameters, starting and ending index.

val list = mutableListOf(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
println(list.subList(0,4)) //prints [1, 2, 3,4]

edited Feb 16 '23 at 15:19

helvete

2,455
13
33
37

answered Feb 13 '23 at 10:48

Sanket Zade

11
1

Get Item between ranges of list kotlin

2 Answers2