Collections API in Kotlin?

Answer

Kotlin provides a rich standard library for Collections, extending Java's capabilities.

Key Categories

1. List: Ordered collection (MutableList, List).
2. Set: Unique elements (MutableSet, Set).
3. Map: Key-Value pairs (MutableMap, Map).

Powerful Operators

• Transformation: `map`, `flatMap`, `zip`
• Filtering: `filter`, `filterNot`, `filterNotNull`
• Finding: `find`, `first`, `last`, `any`, `all`
• Grouping: `groupBy`, `partition`
• Ordering: `sortedBy`, `reversed`

Lazy Evaluation (Sequences)

For large collections, use `asSequence()` to perform operations lazily (like Java Streams) to avoid creating intermediate lists.