foo(string1 = "b")

fun foo(string1: String, bool: Boolean = true) {}
fun main(args: Array<String>) {
    foo("b")
}

Only one parameter may be marked as vararg . If a vararg parameter is not the last one in the list, values for the following parameters can be passed using the named argument syntax, or, if the parameter has a function type, by passing a lambda outside parentheses.

fun foo(bool: Boolean = true, vararg strings: String) {}

fun foo2(bool: Boolean = true, string: String) {}

task

convert to expression body

"${ it.Specification?.make.orEmpty() } ${ it.Specification?.model.orEmpty() }"

class S3ContextBuilder(bucketName: String = "", s3Client: AmazonS3? = null) {
    infix fun String.moveTo(destinationPath: String) {
        this copyTo destinationPath
        this.delete()
    }
}

Map<String, Array<String>>

{a=[1],b=[1, 2]}

{a=[Ljava.lang.String;@2bb4a0bf, b=[Ljava.lang.String;@6f7d77e2]}

String[]

toTypedArray()

Map<String, Array<String>>