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+[[Creating a reference to a variable is called borrowing]]
+
+---
+
+If a function modifies a borrowed variable, we can try to find a way to shorten the lifetime of the borrow.
+
+One way would be to clone the value into a new variable and mutate that, but it can be expensive.
+
+Another way could be to use some property of the variable instead of the variable itself, ie the length of a string.
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