In this guide, we will learn about the Kotlin mutableSetOf() function with lots of examples.
What is mutableSetOf()?
mutableSetOf() is a function in Kotlin's standard library that creates an instance of a mutable set. A set is a collection that doesn't allow duplicate elements. When we say "mutable," it means that the set can be changed after it's been created. You can add, remove, or modify elements in a mutable set.
Basic Syntax:
val mutableSet: MutableSet<Type> = mutableSetOf(element1, element2, ...)Examples with Outputs
Constructing a Mutable Set
val animals = mutableSetOf("Cat", "Dog", "Bird")
println(animals) // Output: [Cat, Dog, Bird]Adding Elements to a Mutable Set
val veggies = mutableSetOf("Broccoli", "Carrot")
veggies.add("Pepper")
println(veggies) // Output: [Broccoli, Carrot, Pepper]Removing Elements from a Mutable Set
val fruits = mutableSetOf("Apple", "Banana", "Cherry")
fruits.remove("Banana")
println(fruits) // Output: [Apple, Cherry]Element Uniqueness in Mutable
Sets Remember, sets inherently ensure element uniqueness:
val numbers = mutableSetOf(1, 2, 2, 3)
println(numbers) // Output: [1, 2, 3]Combining Two Mutable
Sets Merging retains unique elements:
val setA = mutableSetOf(1, 2, 3)
val setB = mutableSetOf(3, 4, 5)
setA.addAll(setB)
println(setA) // Output: [1, 2, 3, 4, 5]Checking for Elements
Using Kotlin's in operator:
val colors = mutableSetOf("Red", "Green", "Blue")
println("Yellow" in colors) // Output: falseClearing All Elements
val letters = mutableSetOf('a', 'b', 'c')
letters.clear()
println(letters) // Output: []Retaining Specific Elements
Retain elements that are present in another collection:
val setOne = mutableSetOf(1, 2, 3, 4)
setOne.retainAll(listOf(3, 4, 5, 6))
println(setOne) // Output: [3, 4]
Conclusion
In this guide, we learned everything about Kotlin mutableSetOf() with lots of examples. So mutableSetOf() is a function in Kotlin's standard library, tailored to instantiate a mutable set. Unlike its immutable counterpart created by setOf(), a mutable set allows additions, modifications, and removal of elements post-creation.
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