![]() We also need to remember that mapping from a list to a map takes some time as well, so if we do it often, it might hurt our performance as well. It is not so important on the frontend (by that I mean also Android or iOS) where a user will access this repository at most a few times. Converts the given objects into a map of potentially cached and interned strings where the keys and values are alternating. ![]() This is why it is especially important on backend where those collections might be accessed many times per second. Kotlin map supports efficiently retrieving the value for the corresponding key. ![]() The keys are unique in a map while for each key there can be one value. Maps are used to hold the pairs of objects in the form of key/value. ![]() HashMap is mutable collection which provides both read am write functionalities. It contains pairs of data in the form of key and value. It returns a new HashMap with the specified contents. It is more useful when we often need to access those elements. The map is an interface and a collection in Kotlin. Kotlin HashMap: hashMapOf () A hashMapOf () is a function of HashMap class. This technique is important, but it is not for all the cases. They are generally given to us as a list, and it is tempting to represent them in our memory the same way: class NetworkUserRepo( val userService: UserService): UserRepo Converting to map takes the same time as in mapOf (the vararg of pairs is processed in the same way as the list above is). Those data might represent some list of users, ids, configurations, etc.
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