R Under development (unstable) (2023-06-13 r84537 ucrt) -- "Unsuffered Consequences"
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> library(quantmod)
Loading required package: xts
Loading required package: zoo

Attaching package: 'zoo'

The following objects are masked from 'package:base':

    as.Date, as.Date.numeric

Loading required package: TTR
Registered S3 method overwritten by 'quantmod':
  method            from
  as.zoo.data.frame zoo 
> 
> api.key <- "abc"
> src <- "xyz"
> 
> # {{{ Unexported function
> 
> ### function name as character
> ### --------------------------
> 
> ## default argument as character
> # set
> setDefaults("getQuote.av", api.key = "abc")
> default.key <- getDefaults("getQuote.av")[["api.key"]]
> stopifnot(identical("'abc'", default.key))
> # unset
> unset <- unsetDefaults("getQuote.av", confirm = FALSE)
> stopifnot(!is.null(unset))  # should not be NULL
> default.key <- getDefaults("getQuote.av")[["api.key"]]
> stopifnot(is.null(default.key))
> 
> ## default argument as symbol
> # set 
> setDefaults("getQuote.av", api.key = api.key)
> default.key <- getDefaults("getQuote.av")[["api.key"]]
> stopifnot(identical(sQuote(api.key), default.key))
> # unset
> unset <- unsetDefaults("getQuote.av", confirm = FALSE)
> stopifnot(!is.null(unset))  # should not be NULL
> default.key <- getDefaults("getQuote.av")[["api.key"]]
> stopifnot(is.null(default.key))
> 
> ### function name as symbol
> ### -----------------------
> 
> ## default argument as character
> # set
> setDefaults(getQuote.av, api.key = "abc")
> default.key <- getDefaults(getQuote.av)[["api.key"]]
> stopifnot(identical("'abc'", default.key))
> # unset
> unset <- unsetDefaults(getQuote.av, confirm = FALSE)
> stopifnot(!is.null(unset))  # should not be NULL
> default.key <- getDefaults(getQuote.av)[["api.key"]]
> stopifnot(is.null(default.key))
> 
> ## default argument as symbol
> fake.key <- "abc"
> # set
> setDefaults(getQuote.av, api.key = fake.key)
> default.key <- getDefaults(getQuote.av)[["api.key"]]
> stopifnot(identical(sQuote(fake.key), default.key))
> # unset
> unset <- unsetDefaults(getQuote.av, confirm = FALSE)
> stopifnot(!is.null(unset))  # should not be NULL
> default.key <- getDefaults(getQuote.av)[["api.key"]]
> stopifnot(is.null(default.key))
> 
> # }}} Unexported function
> 
> 
> # {{{ Exported function
> 
> ### function name as character
> ### --------------------------
> 
> ## default argument as character
> # set
> setDefaults("getSymbols", src = "xyz")
> default.src <- getDefaults("getSymbols")[["src"]]
> stopifnot(identical("'xyz'", default.src))
> # unset
> unset <- unsetDefaults("getSymbols", confirm = FALSE)
> stopifnot(!is.null(unset))  # should not be NULL
> default.src <- getDefaults("getSymbols")[["src"]]
> stopifnot(is.null(default.src))
> 
> ## default argument as symbol
> # set
> setDefaults("getSymbols", src = src)
> default.src <- getDefaults("getSymbols")[["src"]]
> stopifnot(identical("'xyz'", default.src))
> # unset
> unset <- unsetDefaults("getSymbols", confirm = FALSE)
> stopifnot(!is.null(unset))  # should not be NULL
> default.src <- getDefaults("getSymbols")[["src"]]
> stopifnot(is.null(default.src))
> 
> ### function name as symbol
> ### -----------------------
> 
> ## default argument as character
> # set
> setDefaults(getSymbols, src = "xyz")
> default.src <- getDefaults(getSymbols)[["src"]]
> stopifnot(identical("'xyz'", default.src))
> # unset
> unset <- unsetDefaults(getSymbols, confirm = FALSE)
> stopifnot(!is.null(unset))  # should not be NULL
> default.src <- getDefaults(getSymbols)[["src"]]
> stopifnot(is.null(default.src))
> 
> ## default argument as symbol
> # set
> setDefaults(getSymbols, src = src)
> default.src <- getDefaults(getSymbols)[["src"]]
> stopifnot(identical("'xyz'", default.src))
> # unset
> unset <- unsetDefaults(getSymbols, confirm = FALSE)
> stopifnot(!is.null(unset))  # should not be NULL
> default.src <- getDefaults(getSymbols)[["src"]]
> stopifnot(is.null(default.src))
> 
> # }}} Exported function
> 
> proc.time()
   user  system elapsed 
   0.28    0.04    0.32