Scala - Collection

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Scala defines several collection classes:

Articles Related

Type

Base

• Iterable (collections you can iterate on)
• Seq (ordered sequences)
• Set
• Map (lookup data structure)

Immutable

• List (linked list, provides fast sequential access)
• Stream (same as List, except that the tail is evaluated only on demand)
• Vector (array-like type, implemented as tree of blocks, provides fast random access)
• Range (ordered sequence of integers with equal spacing)
• String (Java type, implicitly converted to a character sequence, so you can treat every string like a Seq[Char])
• Map (collection that maps keys to values)
• Set (collection without duplicate elements)

Mutable

• Array (Scala arrays are native JVM arrays at runtime, therefore they are very performant)
• Scala also has mutable maps and sets; these should only be used if there are performance issues with immutable types