lapc.blogg.se - Kotlin map for each

You can read the initial proposal and discussion in this YouTrack issue from 2015 (by Damian Wieczorek). Some time ago, even before Kotlin was released in version 1.0, individuals noticed that extension functions are great but could become even more powerful by allowing not only a single but multiple receivers. Making this a member function of a different class adds even more context to that function as it can only be called from the context of the enclosing class. With an extension function, you specify a receiver object that this function can be called on. We already know extension functions that are highly relevant in this article's setting. Adding context to Kotlin functions was possible even before context receivers entered the game. The language makers decided to come up with a prototype to demonstrate the design proposal solving the highly popular use case of adding context to Kotlin functions. Over a year ago, in February 2022, when Kotlin 1.6.20 was released, the language introduced context receivers for the first time. If you need to perform frequent lookups or modifications, a different data structure such as a hash table or a binary tree may be more appropriate.Why Kotlin needs Context Receivers and how to use them

The map data structure can become inefficient if the number of key-value pairs is very large, as it requires O(n) time to search for a key in the worst case.

To add or remove elements, you must create a new map or use a mutable map.

The read-only nature of the map means that it cannot be modified once it is created.

The read-only nature of the map makes it safe to pass between functions and threads without worrying about concurrent modifications.

The mapOf() function is easy to use and provides a simple way to create a new read-only map with initial key-value pairs.

The map data structure provides a way to associate a key with a value, which is useful for organizing and retrieving data.

Finally, we check if the map contains the key “Mary” using the containsKey() function and print the result to the console. We then retrieve the value associated with the key “John” using the square bracket notation and store it in the variable johnAge. In this example, we create a new read-only map of strings using the mapOf() function with the key-value pairs “John” to 25, “Mary” to 30, and “Bob” to 20.

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