list_override: Add/Replace Elements of First List with Elements of Second...
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Description Usage Arguments Details Value Note Author(s) References See Also Examples

Adds each element of list2 to list1, overriding any elements of the same name. Similar to modifyList function in utils package, but either list can be NULL. Useful for do.call statements, when you want to combine a list of default inputs with a list of user-specified inputs.

1	list.override(list1, list2)

`list1`	Initial list that has some number of named elements. Can be `NULL` or an empty list.
`list2`	List with named elements that will be added to `list1`, replacing any elements with the same name. Can be `NULL` or an empty list.

A list containing the named elements initially in list1 and not in list2, any additional named elements in list2, and any named elements in list1 that were replaced by elements of the same name in list2.

Dane R. Van Domelen

Acknowledgment: This material is based upon work supported by the National Science Foundation Graduate Research Fellowship under Grant No. DGE-0940903.

modifyList, do.call

# Create list that has default inputs to the plot function
list.defaults <- list(x = 1: 5, y = 1: 5, type = "l", lty = 1)

# Create list of user-specified inputs to the plot function
list.user <- list(main = "A Straight Line", lty = 2, lwd = 1.25)

# Combine the two lists into one, giving priority to list.user
list.combined <- list.override(list.defaults, list.user)

# Plot data using do.call
do.call(plot, list.combined)