listOf(...)

add

remove

if(!item.name.isNullOrEmpty()){
            itemMap["name"] = AttributeValue().withS(item.name)
        }

enum class LastFmImageSize {
    @field:Json(name = "medium")
    MEDIUM,
    @field:Json(name = "small")
    SMALL
}

enum class LastFmImageSize {
    @field:Json(name = "medium") MEDIUM,
    @field:Json(name = "small") SMALL
}

val start = 0

listOf(3, 3, 3, 2)

listOf(IntRange(0, 2), IntRange(3, 5), IntRange(6, 8), IntRange(9, 10))

listOf(1, 2, 3) -> (1, 2); (1,3); (2,1); (2,3); (3,1); (3,2)

InputStream

byte[] buffer = new byte[CHUNK_SIZE];
while ((bytesRead = stream.read(buffer, 0, CHUNK_SIZE)) != -1) {
    // do things
}

lines

read

listOf(1,2,3,4,5).forEach {
        if (it > 3) //actually evaluates 5 times
        	return@forEach
    }

forEach

data class Testing(val test: Int = 5)
var test: Testing? = null
if (test == null) test = Testing(3)
test.test // works
test = test.copy() // works
for (i in (1..10)) {
  test = test.copy() // complains about test being Testing?
}

fun Any.castTo(cast: Something) = this as cast

inline fun <reified T> Any.castTo() = this as T

val a = 12
val binaryString = a.toString(radix = 2)
    
//how to convert binaryString back to Int? Is there any build in function in stdlib?

equals

reified R

inline fun <reified R> defaultComparator(): Comparator<R>? = when {
    R::class.isSubclassOf(Comparable::class) -> naturalOrder<R>()  // Error: Type arg not within bounds
    // ... others
    else -> null
}