Does Kotlin have a syntax for Map literals?

You can do:

val map = hashMapOf(
  "John" to "Doe",
  "Jane" to "Smith"
)

Here, to is an infix function that creates a Pair.

Or, more abstract: use mapOf() like

val map = mapOf("a" to 1, "b" to 2, "c" to 3)

( found on kotlinlang )

There is a proposal to add them to the language:

Kotlin/KEEP: Collection Literals

If this goes through, the syntax might be like:

val map = ["a" : 1, "b" : 2, "c" : 3]

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