What methods do you use to improve efficiency when working with data arrays?

To improve the efficiency of working with data arrays in Android (and Java/Kotlin in general), I use the following methods:

• Using appropriate data structures: if a dynamic size is needed, it's better to use ArrayList or LinkedList instead of arrays.
• Minimizing data copying: avoid unnecessary copies and create arrays of the required size immediately.
• Using streams and lambdas for concise and efficient data processing.
• Applying parallel processing (for example, with parallelStream() in Java 8+) for large arrays.
• Using specialized libraries and algorithms for sorting and searching.
• In Kotlin — using extension functions and collections for convenient and efficient work.

Example in Kotlin for filtering and transforming an array:

val numbers = arrayOf(1, 2, 3, 4, 5)
val evenSquares = numbers.filter { it % 2 == 0 }.map { it * it }
println(evenSquares) // [4, 16]