What is the difference between List and Sequence data structures in terms of usage and features?

In the context of Android (and Kotlin), List and Sequence are different data structures with different usage characteristics:

• List is a collection that stores elements in memory and allows quick access by index. Operations on List are usually performed immediately (eagerly). This is convenient when you need to repeatedly access elements or perform operations that require a full traversal.

• Sequence is a lazy data stream that computes elements as needed. Operations on Sequence are deferred until the result is actually required. This is useful for processing large or potentially infinite data sets where you don't want to load everything into memory at once.

Example:

val list = listOf(1, 2, 3, 4)
val sequence = list.asSequence()

// List: operations are performed immediately
val doubledList = list.map { it * 2 }

// Sequence: operations are performed lazily
val doubledSequence = sequence.map { it * 2 }

// doubledSequence will only be computed when toList() or another terminal operation is called
val result = doubledSequence.toList()

Thus, List is suitable for small and fixed data sets, while Sequence is for efficient lazy processing of large data streams.