Hash a function call

Creates a string that uniquely identifies a function call by the function's name and a hash of the specified arguments.

Usage

hash_fn_call(from_fn, ...)

Arguments

from_fn

Name of the function from which hash_fn_call() is called. A character scalar.

...

Arguments from_fn was called with. Any arguments omitted here won't be taken into account when generating the hash.

Value

A character scalar.

Details

This function does evaluate all arguments in .... I.e. the function call mypkg::foo(a = my_var) will be cached as "foo-ff6a1ba723cae45aeee265a71493cecf" if my_var's value is 100, whereas it will become "foo-3f6860362d51e26829cc6f2f3b2968e9" if my_var's value is 101. See examples below.

See also

Other object handling functions: cache_obj(), get_obj(), is_cached(), rm_obj()

Examples

foo <- function(a, b = "default") pkgpins::hash_fn_call("foo", a, b)

foo("bar")
#> [1] "foo-782c297a474889e0e16c91d7218df53a"
a <- "bar"
foo(a)
#> [1] "foo-782c297a474889e0e16c91d7218df53a"
a <- "barbie"
foo(a)
#> [1] "foo-cfb2a469df5d0d7742cfd54f435a16f2"
a |> foo()
#> [1] "foo-cfb2a469df5d0d7742cfd54f435a16f2"
a |> foo(b = "default")
#> [1] "foo-cfb2a469df5d0d7742cfd54f435a16f2"

# you can also create a hash that is based on a subset of all function arguments
foo <- function(a, b = "default") pkgpins::hash_fn_call("foo", b)

foo("bar")
#> [1] "foo-70aa9861fd915a068381031ccbb9e55d"
foo("barrr")
#> [1] "foo-70aa9861fd915a068381031ccbb9e55d"
foo(b = "bar")
#> [1] "foo-3606446b81d5551067274d18bbff6700"