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Map and MutableMap samples
// immutable map and mutable map
val desserts = hashMapOf("whipped cream" to "cake", "chocolate" to "cookie")
if( desserts.isNotEmpty()) {
println("desserts size is ${desserts.size}" )
// contains key
println(desserts.containsKey("chocolate")) //true
// contains value
println(desserts.containsValue("cake")) //true
// contains key
println(desserts.contains("chocolate")) //true
println("chocolate" in desserts) //true
val inventory = mutableMapOf("pancake" to 1)
inventory.put("cake", 3)
if( inventory.isNotEmpty()) {
println("inventory size is ${inventory.size}" )
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