wiki:BigIdeas/Immutability

Immutable data

Immutability means that there is no over-writes of data in principle. A new copy (version) of the data structure is created instead.

This has a huge implication, namely it guarantees that once defined a value stays the same, no matter what. This mimics a fundamental notion from math - a = 1 is an assertion of truth, while a = a + 1 is nonsense.

This is also called Referential Transparency.

Last modified 3 years ago Last modified on Sep 1, 2016, 1:47:15 PM
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