EraCode practice
Config Snapshot: Read an Env Var with a Safe Default
RadvancedMulti-Part
Summary
Practice a small but nuanced environment/config pattern in R: reliably reading a configuration value from an environment variable while providing a deterministic default.
Problem preview
### Goal Complete so it returns the value of an environment variable **unless** it is **unset or empty**, in which case it returns . ### Constraints - Exactly one gap to fill. - Use base R (no packag…
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