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Programming Concepts Intermediate

What is Immutable Object?

An object whose state cannot be modified after creation, providing thread safety and predictable behavior in concurrent systems.

Immutable objects, once created, cannot have their fields changed. Any modification creates a new object instead. This eliminates a class of bugs related to shared mutable state in concurrent programs — no locks are needed because the data cannot change. In Python, tuples and frozensets are immutable. In Java, Strings are immutable. Functional programming languages (Haskell, Clojure) default to immutability. Benefits include simpler reasoning about code, safe sharing between threads, reliable hash keys, and easier undo/redo implementations. The trade-off is potential memory overhead from creating new objects for every change, though structural sharing can mitigate this.

Related Terms

Unit Testing
Testing individual components or functions of a program in isolation to verify they work correctly.
Agile
A software development methodology that emphasizes iterative development, collaboration, and rapid response to change.
Stack vs Heap
Two memory regions: the stack stores function call data with automatic cleanup, while the heap stores dynamically allocated objects.
Memoization
An optimization technique that caches function results for given inputs, avoiding redundant computations for repeated calls.
Recursion
A programming technique where a function calls itself to solve a problem by breaking it into smaller subproblems.
SOLID Principles
Five design principles for writing maintainable, flexible object-oriented code: Single Responsibility, Open-Closed, Liskov Substitution, Interface Segregation, and Dependency Inversion.
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