Kodebits Day 20: Map getOrPut

What is the output?

fun main() {
  val m = mutableMapOf("a" to 2)
  val b = m.getOrPut("b") { 9 }
  println(b + (m["a"] ?: 0))
}

Try it in the online Kotlin Playground →

[spoiler title="Solution"]

Answer:

11

Explanation:

getOrPut returns the value for key ‘b’ if present, otherwise inserts and returns the default value (9). Since ‘b’ is missing, it’s added with value 9.

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Further Reading

• Learn the Basics of the Kotlin Language
• Utilize Control Flow in Kotlin