Kotlin Basics Cheat Sheet (DRAFT) by BeckyIndirectlyToo

val count = 42
if (count == 42) {
  println ("I have the answer")
} else if (count > 35 && count < 49) {
  printlin ("The answer is close")
} else {
  println ("The answer eludes me.")
}

cal answerString = when {
  count == 42 -> "I have the answer"
  count > 35 -> "The answer is close."
  else -> "The answer eludes me."
}

// once an array is created the size is fixed
val school = arrayOf("shark", "salmon", "minnow", 2)
println(java.util.Arrays.toString(school))

//mixed type array
val numbers = intArrayOf(1,2,3)

//print array
for (element in school){
  print(element + " ")
}

// concatenate arrays
array3 = array1 + array2

// initialize array with code
val array = Array (5) { it * 2}

// create list, cannot be changed
val school = listOf("mackerel", "trout")

// create list, can be changed
val myList = mutableListOf("tuna'", "salmon") 
myList.remove("shark")

// create function
var count:Int = 42
fun generateAnswerString(): String {
  val answerString = if (count ==42) {
    "I have the answer."
  } else {
    "The anwer eludes me"
  }
  return answerString
}

//Anonymous functions
val stringLengthFunc: (String) -> Int = {input ->
  input.length
}

// call anonymous function
val stringLength: Int = stringLengthFunc("Android")

//create class
class Car{
  //properties
  val wheels = listOf<Wheel>()
}

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

//print range of numbers or letters
for (i in 'a'..'h') print (i)
for (i in 5 downTo 1 step 1.5) print(i)

var bubbles = 0
while (bubbles < 50) {
  bubbles++
}
println("$bubbles bubbles in the water/n")

do {
  bubbles--
} while (bubbles > 50)
println("$bubbles bubbles in the water/n")

repeat(2) {
  println("A fish is swimming.")
}

// void function
fun printSum(a: Int, b: Int): Unit {
  println("sum of $a and $b is ${a + b}")
}

// functions that can take functions as arguments
fun stringMapper(str:String, mapper: (String) -> Int): Int {
  //Invoke function
  return mapper(str)
}

//**anonymous function can be called outside the parenthesis
stringMapper("Android") { input ->
  input.length
}