# IntSet # IntSet Artifact:[androidx.collection:collection](https://developer.android.com/jetpack/androidx/releases/collection) [View Source](https://cs.android.com/search?q=file:androidx/collection/IntSet.kt+class:androidx.collection.IntSet) Added in[1.4.0](https://developer.android.com/jetpack/androidx/releases/collection#1.4.0) *** ** * ** *** Kotlin\|[Java](https://developer.android.com/reference/androidx/collection/IntSet "View this page in Java") Common/AllAndroid/JVMNative/C/iOSJavaScript - Cmn ``` sealed class IntSet ``` Known direct subclasses [MutableIntSet](https://developer.android.com/reference/kotlin/androidx/collection/MutableIntSet) |---------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [MutableIntSet](https://developer.android.com/reference/kotlin/androidx/collection/MutableIntSet) | [MutableIntSet](https://developer.android.com/reference/kotlin/androidx/collection/MutableIntSet)is a container with a[MutableSet](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin.collections/-mutable-set/index.html)-like interface based on a flat hash table implementation. | *** ** * ** *** [IntSet](https://developer.android.com/reference/kotlin/androidx/collection/IntSet)is a container with a[Set](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin.collections/-set/index.html)-like interface designed to avoid allocations, including boxing. This implementation makes no guarantee as to the order of the elements, nor does it make guarantees that the order remains constant over time. Though[IntSet](https://developer.android.com/reference/kotlin/androidx/collection/IntSet)offers a read-only interface, it is always backed by a[MutableIntSet](https://developer.android.com/reference/kotlin/androidx/collection/MutableIntSet). Read operations alone are thread-safe. However, any mutations done through the backing[MutableIntSet](https://developer.android.com/reference/kotlin/androidx/collection/MutableIntSet)while reading on another thread are not safe and the developer must protect the set from such changes during read operations. | See also | |---------------------------------------------------------------------------------------------------|---| | [MutableIntSet](https://developer.android.com/reference/kotlin/androidx/collection/MutableIntSet) | | ## Summary | ### Protected constructors | |--------------------------------------------------------------------------------------------------|-----| | [IntSet](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#IntSet())`()` | Cmn | | ### Public functions | |-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----| | `inline `[Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [all](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#all(kotlin.Function1))`(predicate: (element: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`) `->` `[Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html)`)` Returns true if all elements match the given[predicate](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#all(kotlin.Function1)). | Cmn | | [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [any](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#any())`()` Returns`true`if this set has at least one element. | Cmn | | `inline `[Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [any](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#any(kotlin.Function1))`(predicate: (element: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`) `->` `[Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html)`)` Returns true if at least one element matches the given[predicate](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#any(kotlin.Function1)). | Cmn | | `operator `[Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [contains](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#contains(kotlin.Int))`(element: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`)` Returns`true`if the specified[element](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#contains(kotlin.Int))is present in this set,`false`otherwise. | Cmn | | `@`[IntRange](https://developer.android.com/reference/kotlin/androidx/annotation/IntRange)`(from = 0) `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [count](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#count())`()` Returns the number of elements in this set. | Cmn | | `inline @`[IntRange](https://developer.android.com/reference/kotlin/androidx/annotation/IntRange)`(from = 0) `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [count](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#count(kotlin.Function1))`(predicate: (element: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`) `->` `[Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html)`)` Returns the number of elements matching the given[predicate](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#count(kotlin.Function1)). | Cmn | | `open operator `[Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [equals](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#equals(kotlin.Any))`(other: `[Any](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html)`?)` Compares the specified object[other](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#equals(kotlin.Any))with this set for equality. | Cmn | | `inline `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [first](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#first())`()` Returns the first element in the collection. | Cmn | | `inline `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [first](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#first(kotlin.Function1))`(predicate: (element: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`) `->` `[Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html)`)` Returns the first element in the collection for which[predicate](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#first(kotlin.Function1))returns`true`. | Cmn | | `inline `[Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [forEach](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#forEach(kotlin.Function1))`(block: (element: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`) `->` `[Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html)`)` Iterates over every element stored in this set by invoking the specified[block](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#forEach(kotlin.Function1))lambda. | Cmn | | `open `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [hashCode](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#hashCode())`()` Returns the hash code value for this set. | Cmn | | [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [isEmpty](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#isEmpty())`()` Indicates whether this set is empty. | Cmn | | [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [isNotEmpty](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#isNotEmpty())`()` Returns`true`if this set is not empty. | Cmn | | [String](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html) | [joinToString](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#joinToString(kotlin.CharSequence,kotlin.CharSequence,kotlin.CharSequence,kotlin.Int,kotlin.CharSequence))`(` ` separator: `[CharSequence](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-char-sequence/index.html)`,` ` prefix: `[CharSequence](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-char-sequence/index.html)`,` ` postfix: `[CharSequence](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-char-sequence/index.html)`,` ` limit: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`,` ` truncated: `[CharSequence](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-char-sequence/index.html) `)` Creates a String from the elements separated by[separator](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#joinToString(kotlin.CharSequence,kotlin.CharSequence,kotlin.CharSequence,kotlin.Int,kotlin.CharSequence))and using[prefix](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#joinToString(kotlin.CharSequence,kotlin.CharSequence,kotlin.CharSequence,kotlin.Int,kotlin.CharSequence))before and[postfix](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#joinToString(kotlin.CharSequence,kotlin.CharSequence,kotlin.CharSequence,kotlin.Int,kotlin.CharSequence))after, if supplied. | Cmn | | `inline `[String](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html) | [joinToString](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#joinToString(kotlin.CharSequence,kotlin.CharSequence,kotlin.CharSequence,kotlin.Int,kotlin.CharSequence,kotlin.Function1))`(` ` separator: `[CharSequence](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-char-sequence/index.html)`,` ` prefix: `[CharSequence](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-char-sequence/index.html)`,` ` postfix: `[CharSequence](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-char-sequence/index.html)`,` ` limit: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`,` ` truncated: `[CharSequence](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-char-sequence/index.html)`,` ` crossinline transform: (`[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`) `->` `[CharSequence](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-char-sequence/index.html) `)` Creates a String from the elements separated by[separator](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#joinToString(kotlin.CharSequence,kotlin.CharSequence,kotlin.CharSequence,kotlin.Int,kotlin.CharSequence,kotlin.Function1))and using[prefix](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#joinToString(kotlin.CharSequence,kotlin.CharSequence,kotlin.CharSequence,kotlin.Int,kotlin.CharSequence,kotlin.Function1))before and[postfix](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#joinToString(kotlin.CharSequence,kotlin.CharSequence,kotlin.CharSequence,kotlin.Int,kotlin.CharSequence,kotlin.Function1))after, if supplied. | Cmn | | [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [none](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#none())`()` Returns`true`if this set has no elements. | Cmn | | `open `[String](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html) | [toString](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#toString())`()` Returns a string representation of this set. | Cmn | | ### Public properties | |-----------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----| | [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [capacity](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#capacity()) Returns the number of elements that can be stored in this set without requiring internal storage reallocation. | Cmn | | [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [size](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#size()) Returns the number of elements in this set. | Cmn | ## Protected constructors ### IntSet Cmn ``` protected IntSet() ``` ## Public functions ### all Cmn Added in[1.4.0](https://developer.android.com/jetpack/androidx/releases/collection#1.4.0) ``` inline fun all(predicate: (element: Int) -> Boolean): Boolean ``` Returns true if all elements match the given[predicate](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#all(kotlin.Function1)). | Parameters | |------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------| | `predicate: (element: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`) `->` `[Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | called for elements in the set to determine if it returns return`true`for all elements. | ### any Cmn Added in[1.4.0](https://developer.android.com/jetpack/androidx/releases/collection#1.4.0) ``` fun any(): Boolean ``` Returns`true`if this set has at least one element. ### any Cmn Added in[1.4.0](https://developer.android.com/jetpack/androidx/releases/collection#1.4.0) ``` inline fun any(predicate: (element: Int) -> Boolean): Boolean ``` Returns true if at least one element matches the given[predicate](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#any(kotlin.Function1)). | Parameters | |------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------| | `predicate: (element: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`) `->` `[Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | called for elements in the set to determine if it returns`true`for any elements. | ### contains Cmn Added in[1.4.0](https://developer.android.com/jetpack/androidx/releases/collection#1.4.0) ``` operator fun contains(element: Int): Boolean ``` Returns`true`if the specified[element](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#contains(kotlin.Int))is present in this set,`false`otherwise. | Parameters | |----------------------------------------------------------------------------------------|-------------------------------------| | `element: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | The element to look for in this set | ### count Cmn Added in[1.4.0](https://developer.android.com/jetpack/androidx/releases/collection#1.4.0) ``` fun count(): @IntRange(from = 0) Int ``` Returns the number of elements in this set. ### count Cmn Added in[1.4.0](https://developer.android.com/jetpack/androidx/releases/collection#1.4.0) ``` inline fun count(predicate: (element: Int) -> Boolean): @IntRange(from = 0) Int ``` Returns the number of elements matching the given[predicate](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#count(kotlin.Function1)). | Parameters | |------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------| | `predicate: (element: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`) `->` `[Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | Called for all elements in the set to count the number for which it returns`true`. | ### equals Cmn ``` open operator fun equals(other: Any?): Boolean ``` Compares the specified object[other](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#equals(kotlin.Any))with this set for equality. The two objects are considered equal if[other](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#equals(kotlin.Any)): - Is a[IntSet](https://developer.android.com/reference/kotlin/androidx/collection/IntSet) - Has the same[size](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#size())as this set - Contains elements equal to this set's elements ### first Cmn Added in[1.4.0](https://developer.android.com/jetpack/androidx/releases/collection#1.4.0) ``` inline fun first(): Int ``` Returns the first element in the collection. | Throws | |-----------------------------------------------------------------------------------------------------------------------------|----------------------------| | [kotlin.NoSuchElementException](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-no-such-element-exception/index.html) | if the collection is empty | ### first Cmn Added in[1.4.0](https://developer.android.com/jetpack/androidx/releases/collection#1.4.0) ``` inline fun first(predicate: (element: Int) -> Boolean): Int ``` Returns the first element in the collection for which[predicate](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#first(kotlin.Function1))returns`true`. **Note** There is no mechanism for both determining if there is an element that matches[predicate](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#first(kotlin.Function1))*and* returning it if it exists. Developers should use[forEach](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#forEach(kotlin.Function1))to achieve this behavior. | Parameters | |------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------| | `predicate: (element: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`) `->` `[Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | Called on elements of the set, returning`true`for an element that matches or`false`if it doesn't | | Returns | |-----------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------| | [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | An element in the set for which[predicate](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#first(kotlin.Function1))returns`true`. | | Throws | |-----------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [kotlin.NoSuchElementException](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-no-such-element-exception/index.html) | if[predicate](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#first(kotlin.Function1))returns`false`for all elements or the collection is empty. | ### forEach Cmn Added in[1.4.0](https://developer.android.com/jetpack/androidx/releases/collection#1.4.0) ``` inline fun forEach(block: (element: Int) -> Unit): Unit ``` Iterates over every element stored in this set by invoking the specified[block](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#forEach(kotlin.Function1))lambda. | Parameters | |--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------| | `block: (element: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`) `->` `[Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | called with each element in the set | ### hashCode Cmn ``` open fun hashCode(): Int ``` Returns the hash code value for this set. The hash code of a set is defined to be the sum of the hash codes of the elements in the set. ### isEmpty Cmn Added in[1.4.0](https://developer.android.com/jetpack/androidx/releases/collection#1.4.0) ``` fun isEmpty(): Boolean ``` Indicates whether this set is empty. ### isNotEmpty Cmn Added in[1.4.0](https://developer.android.com/jetpack/androidx/releases/collection#1.4.0) ``` fun isNotEmpty(): Boolean ``` Returns`true`if this set is not empty. ### joinToString Cmn Added in[1.4.0](https://developer.android.com/jetpack/androidx/releases/collection#1.4.0) ``` fun joinToString(     separator: CharSequence = ", ",     prefix: CharSequence = "",     postfix: CharSequence = "",     limit: Int = -1,     truncated: CharSequence = "..." ): String ``` Creates a String from the elements separated by[separator](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#joinToString(kotlin.CharSequence,kotlin.CharSequence,kotlin.CharSequence,kotlin.Int,kotlin.CharSequence))and using[prefix](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#joinToString(kotlin.CharSequence,kotlin.CharSequence,kotlin.CharSequence,kotlin.Int,kotlin.CharSequence))before and[postfix](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#joinToString(kotlin.CharSequence,kotlin.CharSequence,kotlin.CharSequence,kotlin.Int,kotlin.CharSequence))after, if supplied. When a non-negative value of[limit](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#joinToString(kotlin.CharSequence,kotlin.CharSequence,kotlin.CharSequence,kotlin.Int,kotlin.CharSequence))is provided, a maximum of[limit](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#joinToString(kotlin.CharSequence,kotlin.CharSequence,kotlin.CharSequence,kotlin.Int,kotlin.CharSequence))items are used to generate the string. If the collection holds more than[limit](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#joinToString(kotlin.CharSequence,kotlin.CharSequence,kotlin.CharSequence,kotlin.Int,kotlin.CharSequence))items, the string is terminated with[truncated](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#joinToString(kotlin.CharSequence,kotlin.CharSequence,kotlin.CharSequence,kotlin.Int,kotlin.CharSequence)). ### joinToString Cmn ``` inline fun joinToString(     separator: CharSequence = ", ",     prefix: CharSequence = "",     postfix: CharSequence = "",     limit: Int = -1,     truncated: CharSequence = "...",     crossinline transform: (Int) -> CharSequence ): String ``` Creates a String from the elements separated by[separator](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#joinToString(kotlin.CharSequence,kotlin.CharSequence,kotlin.CharSequence,kotlin.Int,kotlin.CharSequence,kotlin.Function1))and using[prefix](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#joinToString(kotlin.CharSequence,kotlin.CharSequence,kotlin.CharSequence,kotlin.Int,kotlin.CharSequence,kotlin.Function1))before and[postfix](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#joinToString(kotlin.CharSequence,kotlin.CharSequence,kotlin.CharSequence,kotlin.Int,kotlin.CharSequence,kotlin.Function1))after, if supplied.[transform](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#joinToString(kotlin.CharSequence,kotlin.CharSequence,kotlin.CharSequence,kotlin.Int,kotlin.CharSequence,kotlin.Function1))dictates how each element will be represented. When a non-negative value of[limit](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#joinToString(kotlin.CharSequence,kotlin.CharSequence,kotlin.CharSequence,kotlin.Int,kotlin.CharSequence,kotlin.Function1))is provided, a maximum of[limit](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#joinToString(kotlin.CharSequence,kotlin.CharSequence,kotlin.CharSequence,kotlin.Int,kotlin.CharSequence,kotlin.Function1))items are used to generate the string. If the collection holds more than[limit](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#joinToString(kotlin.CharSequence,kotlin.CharSequence,kotlin.CharSequence,kotlin.Int,kotlin.CharSequence,kotlin.Function1))items, the string is terminated with[truncated](https://developer.android.com/reference/kotlin/androidx/collection/IntSet#joinToString(kotlin.CharSequence,kotlin.CharSequence,kotlin.CharSequence,kotlin.Int,kotlin.CharSequence,kotlin.Function1)). ### none Cmn Added in[1.4.0](https://developer.android.com/jetpack/androidx/releases/collection#1.4.0) ``` fun none(): Boolean ``` Returns`true`if this set has no elements. ### toString Cmn ``` open fun toString(): String ``` Returns a string representation of this set. The set is denoted in the string by the`{}`. Each element is separated by`, `. ## Public properties ### capacity Cmn Added in[1.4.0](https://developer.android.com/jetpack/androidx/releases/collection#1.4.0) ``` val capacity: Int ``` Returns the number of elements that can be stored in this set without requiring internal storage reallocation. ### size Cmn Added in[1.4.0](https://developer.android.com/jetpack/androidx/releases/collection#1.4.0) ``` val size: Int ``` Returns the number of elements in this set.