Shallow Copy

Shallow copy is a programming concept where a new object is created that duplicates the top-level structure of an original object, but references the same nested objects or elements rather than creating copies of them. This means changes to nested objects in the copy affect the original, while changes to top-level properties do not. It is commonly used in languages like JavaScript, Python, and Java for efficient memory usage when deep copying is unnecessary.

Also known as: Shallow Clone, Shallow Duplication, Top-Level Copy, Reference Copy, Shallow Copying

Why learn Shallow Copy?

Developers should use shallow copy when they need a quick, memory-efficient duplication of an object where only top-level modifications are required, and shared references to nested data are acceptable or desired. It is particularly useful in scenarios like creating snapshots of state in UI frameworks (e.g., React), optimizing performance in data processing, or when working with immutable data patterns where nested objects are not mutated.

Learning Resources

• docs: MDN Web Docs: Object.assign()
• tutorial: W3Schools: JavaScript Object.assign()
• docs: Python Documentation: copy — Shallow and deep copy operations
• video: YouTube: Shallow Copy vs Deep Copy in JavaScript
• tutorial: GeeksforGeeks: Shallow Copy and Deep Copy in Java