get_functions: get_functions
In djacobs7/remembr: Spaced Repetition Practice for Learning R

If call_counts_hash_table is NULL, then it will use a default value. Otherwise it needs an environment which is created like this new.env( hash = TRUE, parent = emptyenv())

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get_functions(expression, call_counts_hash_table = NULL,
  needs_substitute = TRUE, libraries = NULL,
  calling_environment = NULL, throw_errors = FALSE)

`expression`	an R expression. This will be not be evaluated; but it will be parsed and the methods found will be returned in the result
`call_counts_hash_table`	A call_counts_hash_table environment; this is where results get written to.
`needs_substitute`	( TODO NOT SURE)
`libraries`	( TODO NOT SURE )
`calling_environment`	The calling environment for the expression. get_functions will try to use the calling_environment to figure out which package is being referenced. Defaults to parent.frame()
`throw_errors`	If TRUE this will throw an error if it cannot parse the expression; otherwise it will print a message