Web Reference: May 5, 2023 · Mutability refers to data types that can be accessed and changed after they've been created and stored in memory. Immutability, on the other hand, refers to data types that you can't change after creating them – but that you can still access in the memory. Jul 15, 2025 · Think of immutability as “save as” because you know it returns a newly changed object while traditional in-place mutation would be like “save” means updating the original and letting go of an earlier state. The structure of the immutable data cannot be changed. Explore the concepts of mutability and immutability in JavaScript, understand their differences, and learn when to use each in your coding practices.
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