- What is the difference between MutableList and List in Kotlin?
- and what is the use of each type?
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You may take a look at the answers here.BakaWaii– BakaWaii2017-09-27 10:58:51 +00:00Commented Sep 27, 2017 at 10:58
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1Possible duplicate of Kotlin and Immutable Collections?AAryan– AAryan2017-09-27 11:46:05 +00:00Commented Sep 27, 2017 at 11:46
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2 Answers
From docs:
List: A generic ordered collection of elements. Methods in this interface support only read-only access to the list; read/write access is supported through the MutableList interface.
MutableList: A generic ordered collection of elements that supports adding and removing elements.
You can modify a MutableList: change, remove, add... its elements. In a List you can only read them.
Comments
SUMMARY: List is read-only while MutableList allows you to add, edit and remove items
List
var language: List<String> = listOf("java", "kotlin", "dart")
List type is an interface which provides read-only access. you are limited to read operations like
get, indexof, subList, contains, size etc
with kotlin you have access to some more functions **like sort, stream,binarySearch
- MutableList
Consider this example:
var mutableLanguage: MutableList<String> = mutableListOf("java", "kotlin", "dart")
with mutablelist you can perform read and write operation i.e., add or remove contents of a list. beside supporting all the functions of interface type List.
add, addAll, replace, replaceAll, set, removeAt etc
