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But in the syntax of scripting language its very easy to create a new string from the old string, destroy old string, replace variable by new string. Which appears mutable from the point of view of the developer

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Can't you do the exact same in compiled languages e.g. C or Rust?

You can, but allocating and deallocating is more tedious without a GC, and if you care about performance, you might want to have mutable strings.

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