This is (should be) the exact equivalent of the Cilia code in Kotlin:

• Types
  • Int, Long, Float
• Variables
  • var x: Int = 42
  • var x = 42
  • val x = 42
  • var words: MutableList<String> = mutableListOf()
  • var names: MutableSet<String> = mutableSetOf()
  • var contactInfoForID: MutableMap<String, ContactInfo> = mutableMapOf()
• Functions
  • fun multiply(a: Int, b: Int): Int { return a * b }
  • fun print(a: ContactInfo) { ... }
  • fun concat(a: String, b: String): String { return ... }
• Loops
  • for (i in 1..10) { ... }
  • for (i in 0 until words.size) { ... }
  • for (i in listOf(5, 7, 11, 13)) { ... }
  • for (word in words) { ... }

Note
In Kotlin Int and 42 are 32 bits wide, not 64 bits.
An Array has a fixed size.