dictionarykotlinliterals

Does Kotlin have a syntax for Map literals?

In JavaScript: {foo: bar, biz: qux}.

In Ruby: {foo => bar, biz => qux}.

In Java:

HashMap<K, V> map = new HashMap<>();
map.put(foo, bar);
map.put(biz, qux);

Surely Kotlin can do better than Java?

Solution

  • 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 )