The answer
Immutability means that once a string is created in memory, its contents cannot be altered. Any modification results in the creation of a brand new string.
Iterating Through Strings Effectively
What does string immutability mean?
More FAQs in Iterating Through Strings Effectively
Structurally it is the same. The main difference is that strings are often immutable, meaning you cannot change individual characters in-place during the loop.
Because strings are immutable, adding to a string inside a loop forces the computer to reallocate memory and copy the data repeatedly, resulting in O(N^2) time complexity.
Use a mutable data structure like a StringBuilder in Java, or push characters to an array in JS/Python and join them at the end.
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