Immutability

The Concept

The concept in which a value cannot be changed after having been created. The values are sometimes also referred to as constant or read-only values.

What to cover

• Explain what immutability is Short explanation of what immutability is, including some of its benefits.
• How can things be made immutable? Are there special keywords? Restrictions?
• Is immutability the default? Are things mutable or immutable by default?

Exercises

Lasagna cooking

This exercise deals with cooking a lasagna dish in the oven. The reference implementation (F#) teaches:

• What immutability is and some of its benefits
• How to define an immutable value

Implementations

Track	Exercise	Changes
F#	lucians-luscious-lasagna	None
Scala	[basics][implementation-scala]	None