Web Reference: In JavaScript, String values are immutable, which means that they cannot be altered once created. For example, the following code will produce an error because the letter B in the string Bob cannot be changed to the letter J: Learn about string basics & immutability in this comprehensive Mastering DSA with JavaScript lesson. Jul 23, 2025 · JavaScript Strings are immutable since once a string is created it will receive a reference in the memory and its value will never change. This means that any operation on a string may give the new string without mutating the main string.
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