Collections

Deep dive on the different collections available in Scala and Java

Scala Collections

Collection	Description	Similar
ArrayBuffer	Mutable collections	StringBuilder
Seq	Ordered collection of elements
List	Linked list, faster inserts, slower random access	NonEmptyList, LazyList
Vector	Indexed sequence, faster random access
Map	Key value pairs, for fast lookups	HashMap, TreeMap
ListMap	Sorted map
Queue	Used when FIFO	ArrayDeque, PriorityQueue
Set	Unordered collection of unique elements	HashSet, TreeSet
Chain	Optimized for adding elements at both the head and tail	NonEmptyChain

From Scala docs

Collections

Immutable collections:

Mutable collections:

Java Collections

Collection	Description	Similar
ArrayList	Mutable - Best for random access and read operations	Scala Vector
LinkedList	Best for frequent insertions and deletions	Scala List
HashSet	No duplicates and no order of elements	Scala Set
TreeSet	Sorted - Best for sorted unique elements and range-based queries	Scala SortedSet
HashMap	stores key-value pairs and does not guarantee any specific order	Scala Map
TreeMap	Stores keys in sorted order	Scala SortedMap