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. 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. Jan 12, 2024 · So strings and other primitives are immutable by default in JavaScript. How about arrays? In JavaScript, arrays are mutable by default. This means that the array can be altered after the array is created. We can modify it "in place", adding, removing, or changing elements. Let's look at an example.
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