Description Usage Arguments Value Examples
expand_list
expands a named list with a given set
of default items, if these are not already in the list,
partially matching their names.
expand_dots
expands the ...
arguments of
the function in which it is called with default values,
using expand_list
. It can only be called
from inside a function.
1 2 3 | expand_list(x, ..., .exact = TRUE, .names = !.exact)
expand_dots(..., .exclude = NULL)
|
x |
input list |
... |
extra named arguments defining the default items. A list of default values can also be passed as a a single unnamed argument. |
.exact |
logical that indicates if the names in |
.names |
logical that only used when |
.exclude |
optional character vector of argument names to exclude from expansion. |
a list
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 | #----------
# expand_list
#----------
expand_list(list(a=1, b=2), c=3)
expand_list(list(a=1, b=2, c=4), c=3)
# with a list
expand_list(list(a=1, b=2), list(c=3, d=10))
# no partial match
expand_list(list(a=1, b=2, c=5), cd=3)
# partial match with names expanded
expand_list(list(a=1, b=2, c=5), cd=3, .exact=FALSE)
# partial match without expanding names
expand_list(list(a=1, b=2, c=5), cd=3, .exact=FALSE, .names=FALSE)
# works also inside a function to expand a call with default arguments
f <- function(...){
cl <- match.call()
expand_list(cl, list(a=3, b=4), .exact=FALSE)
}
f()
f(c=1)
f(a=2)
f(c=1, a=2)
#----------
# expand_dots
#----------
# expanding dot arguments
f <- function(...){
expand_dots(list(a=2, bcd='a', xxx=20), .exclude='xxx')
}
# add default value for all arguments
f()
# add default value for `bcd` only
f(a=10)
# expand names
f(a=10, b=4)
|
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