kotlin-stdlib/kotlin.ranges/rangeTo

rangeTo

operator fun <T : Comparable<T>> T.rangeTo(that: T): ClosedRange<T>(source)

Creates a range from this Comparable value to the specified that value.

This value needs to be smaller than or equal to that value, otherwise the returned range will be empty.

Since Kotlin

1.0

Samples

import java.sql.Date
import kotlin.test.assertFalse
import kotlin.test.assertTrue

fun main() { 
   //sampleStart 
   val start = Date.valueOf("2017-01-01")
val end = Date.valueOf("2017-12-31")
val range = start..end
println(range) // 2017-01-01..2017-12-31

println("Date.valueOf("2017-05-27") in range is ${Date.valueOf("2017-05-27") in range}") // true
println("Date.valueOf("2018-01-01") in range is ${Date.valueOf("2018-01-01") in range}") // false
println("Date.valueOf("2018-01-01") !in range is ${Date.valueOf("2018-01-01") !in range}") // true 
   //sampleEnd
}