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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

Singleton Pattern
A design pattern that restricts a class to a single instance and provides a global point of access to that instance.
Garbage Collection
An automatic memory management process that identifies and reclaims memory no longer in use by a program.
Observer Pattern
A design pattern where an object (subject) maintains a list of dependents (observers) that are notified automatically of state changes.
Binary Search
An efficient search algorithm that finds a target value in a sorted array by repeatedly dividing the search interval in half.
SOLID Principles Breakdown
Five object-oriented design principles that guide developers in creating maintainable, flexible, and scalable software systems.
Concurrency
The ability of a program to manage multiple tasks that can make progress during overlapping time periods.
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