let, also, apply
fun main() {
val test1 = "hello world".apply {
"test"
}
println(test1) //this -> hello world
val test2 = "hello world".let {
"test"
}
println(test2) //it -> test
val test3 = "hello world".also {
"test"
}
println(test3) //it -> hello world
}
for
for (indexItem in 0..1000) {
println(indexItem)
}