{"id":28778,"date":"2023-01-02T16:56:44","date_gmt":"2023-01-02T11:26:44","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-equivalent-kotlin-code-to-my-f-functional-code-closed\/"},"modified":"2023-01-02T16:56:44","modified_gmt":"2023-01-02T11:26:44","slug":"solved-equivalent-kotlin-code-to-my-f-functional-code-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-equivalent-kotlin-code-to-my-f-functional-code-closed\/","title":{"rendered":"[Solved] Equivalent Kotlin code to my F# functional code [closed]"},"content":{"rendered":"

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The main problem I found was finding an equivalent operator to the pipeOperator|><\/code>, then i found three potential alternatives:<\/p>\n

using .let<\/code>
\nusing .run<\/code>
\nusing infix function<\/code><\/p>\n

Below example was good startup for me to solve my issue:<\/p>\n

fun main(args: Array<String>) {\n    var a = 3\n    val b: Int = 6\n\n\n    println(\"Hello World! doubling, then tripling the sume of $a and $b is \" +\n            \"${(sumx(a,b)\n                    next ::dbl\n                    next ::trpl\n                    )}\")\n\n    println(\"Hello World! doubling, then tripling the sume of $a and $b is \" +\n            \"${(sumx(a,b)\n                    .let (::dbl)\n                    .let (::trpl)\n                    )}\")\n    println(\"Hello World! doubling, then tripling the sume of $a and $b is \" +\n            \"${(sumx(a,b)\n                    .run (::dbl)\n                    .run (::trpl)\n                    )}\")\n\n    println(\"Hello World! doubling, then tripling the sume of $a and $b is \" +\n            \"${(sumx(a,b)\n                    into (::dbl)\n                    into (::trpl)\n                    )}\")\n}\n\nfun sumx (x: Int, y: Int) : Int = x + y\nfun dbl (x: Int): Int = x * 2\nfun trpl (x: Int): Int = x * 3\n\ninfix fun <T, R> T.next(map : (T) -> R) : R = map(this)\ninfix fun <T, R> T.into(func: (T) -> R) = func(this)\n<\/code><\/pre>\n
UPDATE<\/strong><\/p>\n
I Created the gradle project using this command: gradle init --type java-library<\/code><\/p>\n
Deleted the src\/main<\/code> and the src\/test<\/code> folders<\/p>\n
Created the src\/kotlin<\/code> and src\/resources<\/code> folders<\/p>\n
Created my file at src\/kotlin\/Main.kt<\/code> as below:<\/p>\n
import kotlin.coroutines.experimental.buildSequence\n\nfun main(args: Array<String>) {\n    println(\"Hi, Let's start\")\n\n    val series = listOf(\n            30, 21, 29, 31, 40, 48, 53, 47, 37, 39, 31, 29, 17, 9, 20, 24, 27, 35, 41, 38,\n            27, 31, 27, 26, 21, 13, 21, 18, 33, 35, 40, 36, 22, 24, 21, 20, 17, 14, 17, 19,\n            26, 29, 40, 31, 20, 24, 18, 26, 17, 9, 17, 21, 28, 32, 46, 33, 23, 28, 22, 27,\n            18, 8, 17, 21, 31, 34, 44, 38, 31, 30, 26, 32\n    )\n\n    fun initialSeasonalComponents(series: List<Int>, slen: Int): Map<Int, Double> {\n        val nSeasons = (series.size \/ slen).toFloat()\n        val grouped = series.map { it.toFloat() }.chunked(slen)\n        val seasonAverages = grouped.map { it.average() }\n        return (0 until slen).associate {\n            Pair(it, grouped.zip(seasonAverages)\n                    .fold(0.0) { s, (els, av) -> els[it] + s - av }\n                    \/ nSeasons)\n        }\n    }\n\n    println(\"Seasons Average\u00df: \\n ${initialSeasonalComponents(series, 12)}\")\n\n    fun initialTrend(series: List<Int>, slen: Int): Double =\n            series.windowed(slen)\n                    .fold(0) { s, x -> x.last() - x.first() + s }\n                    .toFloat() \/ slen.toDouble()\n\n    println(\"Initial Trend: \\n ${initialTrend(series, 12)}\")\n\n    fun tripleExponentialSmoothing(series: List<Int>, slen: Int, alpha: Double, beta: Double, gamma: Double, nPreds: Int): Sequence<Double> {\n        var smooth = 0.0\n        var trend = 0.0\n        val seasonals = initialSeasonalComponents(series, 12).toMutableMap()\n        return buildSequence {\n            for (i in 0 until (series.size + nPreds)) {\n                when {\n                    i == 0 -> {\n                        smooth = series.first().toDouble()\n                        trend = initialTrend(series, slen)\n                        yield(series.first().toDouble())\n                    }\n                    i >= series.size -> {\n                        val m = i - series.size + 1\n                        yield((smooth + m * trend) + (seasonals[i % slen] ?: 0.0 \/* Need default values because of null safety *\/))\n                    }\n                    else -> {\n                        val v = series.first().toDouble()\n                        val lastSmooth = smooth\n                        smooth = alpha * (v - (seasonals[i % slen] ?: 0.0)) + (1.0 - alpha) * (smooth + trend)\n                        trend = beta * (smooth - lastSmooth) + (1.0 - beta) * trend\n                        seasonals[i % slen] = gamma * (v - smooth) + (1.0 - gamma) * (seasonals[i % slen] ?: 0.0)\n                        yield(smooth + trend + (seasonals[i % slen] ?: 0.0))\n                    }\n                }\n            }\n        }\n    }\n\n    val f = tripleExponentialSmoothing(series, 12, 0.716, 0.029, 0.993, 24).toList()\n    val res = f.map {it.format(2)} \/\/ used to format the numbers, can be avoided.\n\n    println(\"Forecast: \\n $res\")\n}\n\nfun Double.format(digits: Int) = java.lang.String.format(\"%.${digits}f\", this) \/\/ Extension function to format the numbers\n<\/code><\/pre>\n
The 0.0<\/code> is the initial state for the fold<\/code> function, { s, (els, av) -> }<\/code> is the operation applied to each element, where s is the accumulator and (els, av)<\/code> is the current element (in this case an entry of a map), which has been deconstructed1, leaving els<\/code> as the key and av<\/code> as the value of the current entry.<\/p>\n
My gradle.build<\/code> is:<\/p>\n
buildscript {\n    ext.kotlin_version = '1.2.21'\n\n    repositories {\n        mavenCentral()\n    }\n    dependencies {\n        classpath \"org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version\"   \/\/ for gradle build\n    }\n}\napply plugin: 'kotlin'\n\nrepositories {     jcenter()    }\n\ndependencies {\n    compile \"org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version\"\n}\n\nsourceSets.main {\n    kotlin.srcDirs += 'src\/kotlin'\n    resources.srcDirs += 'src\/resources'\n}\n\njar {\n    baseName 'myApp'\n    manifest.attributes 'Main-Class': 'MainKt'  \/\/ '[namespace].[arctifact\/file]Kt'\n    from { configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } }\n}\n<\/code><\/pre>\n
The generated jar<\/code> file was saved at build\/libs\/MyApp.jar<\/code> and i run it using command java -jar myApp.jar<\/code><\/p>\n<\/p><\/div>\n
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            <\/span> <\/p><\/div>\n<\/div>\n
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solved Equivalent Kotlin code to my F# functional code [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"
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