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Value types (int, float, string, bool and structs) create a copy of the variable. If you adjust this copied variable within your function you won’t be updating the original. To update the original you’ll have to use a pointer.

Reference types (slices, maps, channels, pointers and functions) operate differently because they're not stored directly where they’re created. If you passed a variable to a function, a copy is made, however, like the original variable, this copy is already acting like a pointer to a value stored elsewhere.

E.g - a slice contains a reference to the actual lying list of records.