any, all, none

These functions check the existence of collection elements that match a given predicate.

Function any

Function any returns true if the collection contains at least one element that matches the given predicate.

fun main() {

    val numbers = listOf(1, -2, 3, -4, 5, -6)            // 1
    
    val anyNegative = numbers.any { it < 0 }             // 2
    
    val anyGT6 = numbers.any { it > 6 }                  // 3

    println("Numbers: $numbers")
    println("Is there any number less than 0: $anyNegative")
    println("Is there any number greater than 6: $anyGT6")
}

1. Defines a collection of numbers.
2. Checks if there are negative elements.
3. Checks if there are elements greater than 6.

Function all

Function all returns true if all elements in collection match the given predicate.

fun main() {

    val numbers = listOf(1, -2, 3, -4, 5, -6)            // 1
    
    val allEven = numbers.all { it % 2 == 0 }            // 2
    
    val allLess6 = numbers.all { it < 6 }                // 3

    println("Numbers: $numbers")
    println("All numbers are even: $allEven")
    println("All numbers are less than 6: $allLess6")
}

1. Defines a collection of numbers.
2. Checks whether all elements are even.
3. Checks whether all elements are less than 6.

Function none

Function none returns true if there are no elements that match the given predicate in the collection.

fun main() {

    val numbers = listOf(1, -2, 3, -4, 5, -6)            // 1
    
    val allEven = numbers.none { it % 2 == 1 }           // 2
    
    val allLess6 = numbers.none { it > 6 }               // 3

    println("Numbers: $numbers")
    println("All numbers are even: $allEven")
    println("No element greater than 6: $allLess6")
}

1. Defines a collection of numbers.
2. Checks if there are no odd elements (all elements are even).
3. Checks if there are no elements greater than 6.