let's say I have a list defined in Kotlin:
val mylist = mutableListOf<List<Int>>(listOf(2,3,5), listOf(2,5,6))
Now, I want to assign a certain value to one of these sublists. For example, now that I have a list of
((2,3,5)(2,5,6))
I would like my list to be
((2,3,5)(2,100,6))
I'm used to doing this in Python by something like myList[1][1] = 100. How do I achieve the same result in Kotlin?
Kotlin has two sets of collection interfaces, the regular List, Set, etc. which are read-only, and the same ones with the Mutable prefix, which can be modified.
listOf will give you a List instance, while mutableListOf gives you a MutableList instance. If you use the latter for creating your nested lists, you can use the exact syntax you've asked about:
val mylist: MutableList<MutableList<Int>> = mutableListOf(mutableListOf(2,3,5), mutableListOf(2,5,6))
mylist[1][1] = 100
println(mylist) // [[2, 3, 5], [2, 100, 6]]
(I've added the explicit type for myList for clarity's sake, it can be omitted from the left side of the assignment.)
