Biorhythms: Difference between revisions

=={{header|Kotlin}}==

{{trans|Java}}

<syntaxhighlight lang="Kotlin">

import java.time.LocalDate

import java.time.format.DateTimeFormatter

import java.time.temporal.ChronoUnit

import kotlin.math.roundToInt

import kotlin.math.sin

fun main() {

val datePairs = listOf(

listOf("1943-03-09", "1972-07-11"),

listOf("1809-01-12", "1863-11-19"),

listOf("1809-02-12", "1863-11-19")

)

for (datePair in datePairs) {

calculateBiorhythms(datePair)

}

}

fun calculateBiorhythms(datePair: List<String>) {

val formatter = DateTimeFormatter.ISO_LOCAL_DATE

val birthDate = LocalDate.parse(datePair[0], formatter)

val targetDate = LocalDate.parse(datePair[1], formatter)

val daysBetween = ChronoUnit.DAYS.between(birthDate, targetDate).toInt()

println("Birth date $birthDate, Target date $targetDate")

println("Days between: $daysBetween")

for (cycle in Cycle.values()) {

val cycleLength = cycle.getLength()

val positionInCycle = daysBetween % cycleLength

val quadrantIndex = 4 * positionInCycle / cycleLength

val percentage = (100 * sin(2 * Math.PI * positionInCycle / cycleLength)).roundToInt()

val description = when {

percentage > 95 -> "peak"

percentage < -95 -> "valley"

Math.abs(percentage) < 5 -> "critical transition"

else -> {

val daysToTransition = (cycleLength * (quadrantIndex + 1) / 4) - positionInCycle

val transitionDate = targetDate.plusDays(daysToTransition.toLong())

val (trend, nextTransition) = cycle.descriptions(quadrantIndex)

"$percentage% ($trend, next $nextTransition $transitionDate)"

}

}

println("${cycle.name} day $positionInCycle: $description")

}

println()

}

enum class Cycle(private val length: Int) {

PHYSICAL(23), EMOTIONAL(28), MENTAL(33);

fun getLength() = length

fun descriptions(index: Int): Pair<String, String> {

val descriptions = listOf(

listOf("up and rising", "peak"),

listOf("up but falling", "transition"),

listOf("down and falling", "valley"),

listOf("down but rising", "transition")

)

return descriptions[index][0] to descriptions[index][1]

}

}

</syntaxhighlight>

{{out}}

<pre>

Birth date 1943-03-09, Target date 1972-07-11

Days between: 10717

PHYSICAL day 22: -27% (down but rising, next transition 1972-07-12)

EMOTIONAL day 21: valley

MENTAL day 25: valley

Birth date 1809-01-12, Target date 1863-11-19

Days between: 20034

PHYSICAL day 1: 27% (up and rising, next peak 1863-11-23)

EMOTIONAL day 14: critical transition

MENTAL day 3: 54% (up and rising, next peak 1863-11-24)

Birth date 1809-02-12, Target date 1863-11-19

Days between: 20003

PHYSICAL day 16: -94% (down and falling, next valley 1863-11-20)

EMOTIONAL day 11: 62% (up but falling, next transition 1863-11-22)

MENTAL day 5: 81% (up and rising, next peak 1863-11-22)

</pre>