R programming tutorial: Environment system and scoping rule in R

R use environment hierarchy for association with objects in the working session. Each object or function has its environment. When one object is referred to, R will first search in its own environment, then search its parent environment if it is not found in its own environment. The process will goes until searching in the highest environment, empty environment.
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#rstudio
#environment
#scoping
#function
#globalenvironment
#rdatacode