val array = arrayOf(1, 2, 3)
for (i in array){
println(i)
}
for (i in 0 until 100){
# 100 не включается
println(i)
}
for (i in 100 down to 0){
# от 100 до 0
println(i)
}
for (i in 100 down to 0 step 2){
# от 100 до 0 с шагом 2
println(i)
}
for ((index, i) in array.withIndex()){
array[index] =
}
if (a < 40) {
...
} else if (a < 60) {
...
} else {
...
}
val count: Integer
count = if (a < 40) {
40
} else if (a < 60) {
50
} else {
# обязательный блок
60
}
val nameOfMonth = "Март"
val season: String
when(nameOfMonth) {
"Декабрь", "Январь", "Февраль" -> {
season = "Зима"
}
else -> {
season = "Не определен"
}
}
# season = "Не определен""
val nameOfMonth = "Март"
val season = when(nameOfMonth) {
"Декабрь", "Январь", "Февраль" -> {
"Зима"
}
else -> {
"Не определен"
}
}
# season = "Не определен""
val nameOfMonth = 4
val season = when(nameOfMonth) {
12, 1, 2 -> {
"Зима"
}
in 3..5 -> {
"Весна"
}
else -> {
"Не определен"
}
}
# season = "Не определен""
val temp = 80
val state = when {
temp < 0 || temp > -10 -> "Твердое"
temp < 100 -> "Жидкое"
else -> "Газообразное"
}
fun max(a: Int, b: Int): Int {
if (a > b) {
return a
} else {
return b
}
}
fun max(a: Int, b: Int): Int {
return if (a > b) {
a
} else {
b
}
}
fun max(a: Int, b: Int): Int = if (a > b) a else b
fun sum(vararg numbers: Int): Int{
var result = 0
for (i in numbers){
result += i
}
return result
}
fun modifyString(string: String, modify: (String) -> String): String {
...
}
inline fun modifyString(...){
...
}
# extension func
fun Int.isAgeValid() = this in 6..100
fun muWith(list: List<Int>, operation: List<Int>.() -> Unit) {
list.operation()
}
fun muWith(list: Any, operation: Any.() -> Unit) {
object.operation()
}
fun<T> muWith(list: T, operation: T.() -> Unit) {
object.operation()
}
inline fun<T> muWith(list: T, operation: T.() -> Unit) {
object.operation()
}
inline fun<T, R> muWith(list: T, operation: T.() -> R): R {
return object.operation()
}
val sum = {a: Int, b: Int - > a + b}
val sum: (Int, Int) -> Int = { a, b -> a + b}
val square: (Int) -> Int = { it + it }
val square: (Int) -> Unit = { it + it }
var name: String? = null
fun main() {
name?.let {
if (it.length > 5) {
....
}
}
}
with(list) {
add(5)
}