Web Reference: Sep 1, 2024 · Mastering the concepts of mutability and immutability in JavaScript is key to writing optimized code for modern applications. This comprehensive guide will explain the internals along with practical examples. Sep 9, 2008 · In JavaScript, strings are immutable objects, which means that the characters within them may not be changed and that any operations on strings actually create new strings. Jan 26, 2026 · I’m going to show you how immutability works in JavaScript strings, why it exists, how the runtime behaves under the hood, and how to use that knowledge to write faster, clearer code.
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