Modifying one variable with map will modify any other similar ones as well

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Beware the Map Function: How One Variable Change Can Impact an Entire Codebase
The map() function is an essential tool in programming, commonly used to iterate over an iterable object and apply a function to each item in the object. It provides an efficient way to transform data in a scalable manner. However, using map() also comes with a danger that can impact an entire codebase: changing the variable that is being mapped.