Reference

Flow Functions
flow_call()	Implicit cache of a function and of the given call.
flow_dfg()	Group-wise caching of operations on data frame.
flow_dfr()	Row-wise caching of operations on data frame.
flow_file_source()	Creates a flow object that watches one or more files.
flow_fn()	Implicit cache of a function and of the given call.
flow_ns_sink()	Write a value to a namespace only if the value has changed.
default_flow_options() set_flow_options() get_flow_options()	flow options used to initialize or update an eddy.
make_flow_fn()	Explicit cache of a function.
collect(<R6Flow>) collect(<Element>)	Get the data from an R6Flow or an Element object.
element() `[`(<R6Flow>)	Extract an element from an R6Flow object.
is_flow()	Is the object a flow object or a flow element?
is_flow_fn()	Is the function a flow function (as returned by make_flow_fn)?
is_not_flow_fn()	Check if the function is NOT a flow function (as returned by make_flow_fn).
is_current()	Does the flow have a "current" state?
is_valid()	Is the current state valid (stored in the cache)?
Eddy Functions
delete_eddy()	Delete eddy and ALL its data from ALL cache layers (memory and/or disk).
get_current_eddy()	Get the current eddy for a given (or default) environment.
get_eddy()	Retrieves an eddy.
new_eddy()	Create a new eddy. Does not affect the current eddy.
set_current_eddy()	Set the current eddy to be used in future flow calls.
use_eddy()	Convenience function that creates a new eddy or re-uses it if present.
Cache Functions
cache_file()	Get the file only cache engine.
cache_memory()	Get the memory only cache engine.
cache_memory_file()	Get the memory-file cache engine.
default_cache()	Get the default cache engine.