Kotlin Sets

Introduction to Kotlin Sets

In Kotlin, a Set is a collection of unique elements, meaning no duplicates are allowed. Sets are particularly useful when you need to ensure that an element appears only once in a collection. Kotlin provides two main interfaces for working with sets: Set and MutableSet.

Immutable Sets

A Set is immutable, meaning that its elements cannot be changed once it is created. To create a set in Kotlin, you can use the setOf function.

As shown in the example above, the setOf function creates an immutable set. You cannot add or remove elements from this set.

Mutable Sets

A MutableSet can be modified after its creation: elements can be added or removed. To create a mutable set, use the mutableSetOf function.

In this example, the mutableSetOf function creates a mutable set. We can add new elements using add and remove existing ones using remove.

Common Set Operations

Kotlin's Set interface provides various operations, such as checking if a set contains an element, iterating over elements, and more. Here are some common operations:

These operations demonstrate the ease of working with sets in Kotlin, allowing for element checks, iteration, and obtaining size information.

Conclusion

Kotlin sets provide a powerful way to manage unique elements in your applications. With immutable and mutable options, you can choose the best fit for your needs, ensuring efficient and straightforward management of data without duplicates.