seniorOOP
What is immutability in OOP and why is it important?
Updated May 17, 2026
Short answer
Immutability means an object's state cannot change after creation.
Deep explanation
Immutable objects eliminate side effects and make systems more predictable. In OOP, immutability improves thread safety, simplifies debugging, and reduces hidden state mutations. Instead of modifying objects, new instances are created with updated values.
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