Web Reference: 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. In this article, we'll delve deep into whether strings in JavaScript are immutable, what that means for developers, and practical examples that illustrate the concept.
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