Get or set function body

fn_body() is a simple wrapper around base::body(). It always returns a { expression and throws an error when the input is a primitive function (whereas body() returns NULL). The setter version preserves attributes, unlike body<-.

fn_body(fn = caller_fn())

fn_body(fn) <- value

Arguments

fn	A function. It is lookep up in the calling frame if not supplied.
value	New formals or formals names for fn.

Examples

# fn_body() is like body() but always returns a block:
fn <- function() do()
body(fn)
#> do()
fn_body(fn)
#> {
#>     do()
#> }

# It also throws an error when used on a primitive function:
try(fn_body(base::list))
#> Error : `fn` is not a closure