Web Reference: Jan 12, 2024 · While JavaScript objects and arrays are mutable by default, adopting an immutable approach to handling them can lead to cleaner, more reliable, and easier-to-maintain code. Dec 21, 2015 · You can try the sexy FP/Immutability approach and add your changes to the News object to an array tracking every historical change so you can then iterate through the array and figure out what the correct state representation should be (phew!). Jul 3, 2025 · While creating new objects and arrays might seem memory-intensive, JavaScript engines and modern libraries like React are highly optimized for this pattern. In practice, immutability often improves performance because it enables efficient change detection and optimization.
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