As to your second question (or proto-question): passing the return value (or values) of one subroutine to another subroutine could be as simple as this: 
other_subroutine(config('username'), 'other', 'stuff');

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Much would depend on whether the  config() subroutine could return more than one item – but that's a discussion for another day.

In reply to Re: Using Subroutine Returns by AnomalousMonk
in thread Using Subroutine Returns by rlang

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