Mutable and Immutable Collections

Mutable and Immutable Collections in Scala

In Scala language collections framework id typically of 2 types.

• Mutable
• Immutable

In Mutable Collections we can change,add or remove the elements. But, in case of immutable collections , they never change. Though you can perform addition, deletion, updation etc operations on the immutable data set but each time it will return you a new variable.

Package:
Mutable: scala.collection.mutable
Immutable: scala.collection.immutable

If you don't explicitly  specify any package name then by default it will point to immutable collection. Please find below some comparisons between two type of collections.

Properties	Mutable	Immutable
Manipulation of Variable	Possible	Not Possible
Speed	Faster	Slower
Memory Allocation	Once defined allocated into memory	In time of execution it uses memory
Data Security	Less	High
Use Case	In time of operations on data we should use this technique.	While exposing the data to end user/third party we should prefer this technique.