Lowercase all HashMap keys

Question

I \'ve run into a scenario where I want to lowercase all the keys of a HashMap (don\'t ask why, I just have to do this). The HashMap has some millions of entries.

At fir

Answer 1

Not sure about the memory footprint. If using Kotlin, you can try the following.

val lowerCaseMap = myMap.mapKeys { it.key.toLowerCase() }

https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/map-keys.html