dtrailin

some_view.setOnClickListener(object : View.OnClickListener {
   override fun onClick(view: View) {
       println("clicked!")
   }
})

dtrailin

val listener: (View) -> Unit = { println(“clicked!”) }
some_view.setOnClickListener (listener)

// Or you can use closures 

some_view.setOnClickListener {doSomething()}

dtrailin

listOf("This", "is","a", "sentence").reduce { accumulator, s -> accumulator +" " + s }

dtrailin

(1..100000).map { it * it }.find { it.toString().contains(Regex(".*123.*")) }

dtrailin

var isChecked: Boolean by object {
   operator fun getValue(thisRef: Any?, property: KProperty<*>): Boolean {
       return checkbox.checked
   }

   operator fun setValue(thisRef: Any?, property: KProperty<*>, value: Boolean) {
       checkbox.checked = value
   }
}

dtrailin

class EditTextDelegate {
    // represents some editable text view
    var editText: EditText = EditText();

    operator fun getValue(thisRef: Any?, property: KProperty<*>): String? {
        return editText.text
    }
    
    operator fun setValue(thisRef: Any?, property: KProperty<*>, value: String?) {
        editText.text = value

dtrailin

class ComposedObject(textDelegate: EditTextDelegate){
  var text: String? by textDelegate
}

dtrailin

class Person(val name: String, val city: String)

dtrailin

tailrec fun fib(count: Long, seq: List<Int> = listOf(1,1)): List<Int> =
       if (seq.size >= count) seq else fib(count, seq + (seq.last() + seq[seq.lastIndex - 1]))

dtrailin

import csv
import os
import subprocess
import time
from io import StringIO
from typing import List, Dict

from datadog import initialize, statsd
from kubernetes import client, config