CODEWITHSUNDEEP
kotlin
David Peter
David Peter

Reputation: 45

How can I do a specific sort using Kotlin?

I have this ArrayList in Kotlin :

a = ArrayList<String>()
a.add("eat")
a.add("animal")
a.add("internet")

And I would like to sort the elements of my ArrayList by frequency of "e" eg I would like to have a new ArrayList such as :

a[0] = "animal" // there is no e in animal
a[1] = "eat" // there is one e in animal
a[2] = "internet" // there is two e in internet

I thought to use Collections.sort(a) but like my sort is specific it won't work...

Do you have any ideas ?

Thank you !

Upvotes: 1

Views: 257

Answers (2)

zsmb13
zsmb13

Reputation: 89568

You can also do this without converting each String to a CharArray first (as in the currently the accepted answer), which I don't know why you'd do:

a.sortBy { it.count { it == 'e' } }

Plus, you might want to name nested its:

a.sortBy { word -> word.count { character -> character == 'e' } }

Upvotes: 3

TomH
TomH

Reputation: 2719

Writing on my phone so the syntax might not be exactly correct, but something like:

a.sortBy { it.toCharArray().count { it == 'e' } }

Upvotes: 2

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