ktuple

A kotlin-native library introducing a tuple data class as a standard Collection implementation. It supports entries up to 10 in size, providing excellent DX on top.

easy to use tuples to speed up the creation of dynamic tests

ktuple/src/test/kotlin/com/bkosm/ktuple/examples/InMemoryPowerCalcTest.kt

Lines 13 to 34 in 412c26a

	internal typealias Arguments = Tuple.Of4<Number, Number, Double, String>
	internal class InMemoryPowerCalcTest {
	fun interface PowerCalc : (Number, Double) -> Double {
	companion object
	}
	private val PowerCalc.Companion.InMemory get() = PowerCalc { a, b -> a.toDouble().pow(b) }
	@TestFactory
	fun `handles exponentiation as expected`() = listOf(
	1 w 2 w 1.0 w "with exponent of 2",
	2 w 2 w 4.0 w "with base of 2",
	2.2 w 3.3 w 13.489468760533386 w "with doubles",
	Arguments(3, 3, 27.0, "with exponents higher than 2"), // can work like named tuples
	).map { (a: Number, b: Number, result: Double, name: String) ->
	dynamicTest(name) {
	val uut = PowerCalc.InMemory
	expect(result) { uut(a, b.toDouble()) }
	}
	}
	}

tests make the best documentation

ktuple/src/test/kotlin/com/bkosm/ktuple/TupleTest.kt

Lines 9 to 115 in 593a02d

	internal class TupleTest {
	private val uut: Tuple = Tuple(1)
	@Test
	fun `there is a size property`() {
	expect(1) { uut.size }
	}
	@Test
	fun `there is a 'contains' check`() {
	assertTrue { uut.contains(1) }
	assertFalse { uut.contains(2L) }
	}
	@Test
	fun `there is a 'containsAll' check`() {
	assertTrue { uut.containsAll(listOf<Any?>(1)) }
	assertFalse { uut.containsAll(listOf<Any?>(1, 2)) }
	}
	@Test
	fun `can be inline destructured`() {
	val (first) = uut as TupleOf1
	expect(1) { first }
	}
	@Test
	fun `values can be accessed via properties`() {
	uut as TupleOf1
	expect(1) { uut._1 }
	}
	@Test
	fun `can be iterated over`() {
	var runs = 0
	for (any in uut) {
	runs++
	}
	expect(1) { runs }
	}
	@Test
	fun `has a emptiness check`() {
	assertFalse { uut.isEmpty() }
	}
	@Test
	fun `null only tuple is considered empty`() {
	assertTrue { Tuple(null, null).isEmpty() }
	}
	@Test
	fun `typealias works with factory functions`() {
	val uut = t(null)
	assertNull(uut._1)
	}
	@Test
	fun `you can do a standard data class 'copy' when the full type is present`() {
	val uut: Tuple.Of2<Int, Double> = t(1, 2.0)
	expect(t(1, 3.0)) { uut.copy(_2 = 3.0) }
	}
	@Test
	fun `you can do a copy with type change through a member function when the full type is present`() {
	val uut: Tuple.Of2<Int, Double> = t(1, 2.0)
	expect(t(null, "hey!")) { uut._2("hey!")._1(null) }
	}
	@Test
	fun `plus operator converts tuples into a list`() {
	val res = uut + t(2, 3) + t(4.0) + listOf(5f)
	expect(listOf<Any?>(1, 2, 3, 4.0, 5f)) { res }
	}
	@Test
	fun `you can search and do all of the collection operations`() {
	val res = uut.firstOrNull { it == 1 }
	expect(1) { res }
	}
	@Test
	fun `you can also append to the tuple itself`() {
	val resultForValidTuple = uut.appendOrNull(2.0)
	val resultForOverflow = AllVariations.last().second.appendOrNull(2.0)
	expect(t(1, 2.0)) { resultForValidTuple }
	assertNull(resultForOverflow)
	}
	@Test
	fun `there is a typesafe and fancy inline factory`() {
	val fullResult = 1 w 2 w 3 w 4 w 5 w 6 w 7 w 8 w 9 w 10
	val overflownResult: Tuple = 1 w 2 w 3 w 4 w 5 w 6 w 7 w 8 w 9 w 10 w 11 w 12
	expect(t(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)) { fullResult }
	expect(t(fullResult, 11, 12)) { overflownResult }
	}
	}

currently available via JitPack

repositories {
    // all the other ones that you might need...

    maven { url = uri("https://jitpack.io") }
}

// and then

dependencies {
    // all the other ones that you might need...
    
    testImplementation("com.github.bkosm:ktuple:1.3.0")
}

you decide on the features!

Drop an issue with what functionality you could use in your Kotlin tuple or submit a PR!