CODEWITHSUNDEEP
kotlin
dmSherazi
dmSherazi

Reputation: 3831

How to convert ArrayList<String?> to List<CharSequence> in kotlin

I am new to kotlin and I am facing this issue

I have an ArrayList<String?> and I have to pass it to a function that accepts List<CharSequence> I tried to find a way to convert them but couldnt, How can I convert ArrayList<String?> to List<CharSequence> in kotlin

Upvotes: 1

Views: 951

Answers (2)

Ekrem
Ekrem

Reputation: 405

CharSequence is an interface and String class is already implemented that. Hence cast to CharSequence should be enough. map function returns List<T>

val list = arrayList.map { it as CharSequence }

With filtering null values

val list: List<CharSequence> = arrayList.filterNotNull()

Upvotes: 0

Tenfour04
Tenfour04

Reputation: 93609

Use

val list: List<CharSequence> = arrayList.filterNotNull()

filterNotNull() removes any possible null values so you have a List<String>, which can be automatically up-cast to a List<CharSequence>.

Upvotes: 4

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