val intent = Intent(this, MyDetailActivity::class.java)
intent.flags = Intent.FLAG_ACTIVITY_CLEAR_TOP or Intent.FLAG_ACTIVITY_SINGLE_TOP
intent.putParcelableArrayListExtra("MyDataList", MyDataList.list);
startActivity(intent)

import android.os.Parcelable
import kotlinx.android.parcel.Parcelize

@Parcelize
data class MyDataList(var list:ArrayList<MyData>) : Parcelable

import android.os.Parcelable
import kotlinx.android.parcel.Parcelize

@Parcelize
data class MyData(var timeStamp: String) : Parcelable

import android.os.Bundle

class MyDetailActivity : Activity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        // 本来はgetParcelableExtraが正しそうだけど以下のエラーになるのでgetSerializableExtraを使う
        // Not enough information to infer type variable T
        // val myDataList = intent.getParcelableExtra("MyDataList") as ArrayList<MyData>
        val myDataList = intent.getSerializableExtra("MyDataList") as ArrayList<*>
        setContentView(view)
    }
}

val school = arrayOf("shark", "salmon", "minnow")
for (element in school) {
    print(element + " ")
}

for ((index, element) in school.withIndex()) {
    println("Item at $index is $element\n")
}

fun isTooHot(temperature: Int) = temperature > 30

val decorations = listOf("rock", "pagoda", "plastic plant", "alligator", "flowerpot")
// 先頭がpの文字列だけを抽出
val eager = decorations.filter({x -> x[0] == 'p'})
// 以下は等価
// val eager = decorations.filter {it[0] == 'p'}
println("eager: $eager")

val waterFilter: (Int) -> Int = { dirty -> dirty / 2 }

// 引数が1つの場合はitとして表現可能
val waterFilter: (Int) -> Int = { it / 2 }

waterFilter(10)

fun increaseDirty( start: Int ) = start + 1
println(updateDirty(15, ::increaseDirty))

fun increaseDirty( start: Int ) = start + 1
println(updateDirty(15, ::increaseDirty))

class TowerTank (override var height: Int, var diameter: Int): Aquarium(height = height, width = diameter, length = diameter) {
  override var volume: Int
    // ellipse area = π * r1 * r2
    get() = (width/2 * length/2 * height / 1000 * PI).toInt()
    set(value) {
        height = ((value * 1000 / PI) / (width/2 * length/2)).toInt()
    }