Named return values
Go's return values may be named and act just like variables.
These names should be used to document the meaning of the return values.
A return statement without arguments returns the current values of the results. This is known as a "naked" return.
Naked return statements should be used only in short functions, as with the example shown here. They can harm readability in longer functions.
Multiple results
A function can return any number of results.
The swap function returns two strings.
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