Difference between `get()` vs. `getFromNamespace()` and function vs. lazydata

get-lazydata.R

# Without dplyr loaded ----
isNamespaceLoaded("dplyr")
#> [1] FALSE

## FUNCTION: Both work for getting `dplyr::mutate`
get("mutate", envir = asNamespace("dplyr"))
#> function (.data, ...) 
#> {
#>     UseMethod("mutate")
#> }
#> <bytecode: 0x000001f61ffaf840>
#> <environment: namespace:dplyr>
getFromNamespace("mutate", "dplyr")
#> function (.data, ...) 
#> {
#>     UseMethod("mutate")
#> }
#> <bytecode: 0x000001f61ffaf840>
#> <environment: namespace:dplyr>

## LAZY DATA: Neither works for getting `dplyr::storms`
get("storms", envir = asNamespace("dplyr"))
#> Error in get("storms", envir = asNamespace("dplyr")): object 'storms' not found
getFromNamespace("storms", "dplyr")
#> Error in get(x, envir = ns, inherits = FALSE): object 'storms' not found

# With dplyr loaded ----
library(dplyr)
isNamespaceLoaded("dplyr")
#> [1] TRUE

## FUNCTION: Both continue to work for `dplyr::mutate`
get("mutate", envir = asNamespace("dplyr"))
#> function (.data, ...) 
#> {
#>     UseMethod("mutate")
#> }
#> <bytecode: 0x000001f61ffaf840>
#> <environment: namespace:dplyr>
getFromNamespace("mutate", "dplyr")
#> function (.data, ...) 
#> {
#>     UseMethod("mutate")
#> }
#> <bytecode: 0x000001f61ffaf840>
#> <environment: namespace:dplyr>

## LAZY DATA: `get()` now works, `getFromNamespace()` still fails
get("storms", envir = asNamespace("dplyr")) |> head(1)
#> # A tibble: 1 × 13
#>   name   year month   day  hour   lat  long status       category  wind pressure
#>   <chr> <dbl> <dbl> <int> <dbl> <dbl> <dbl> <fct>           <dbl> <int>    <int>
#> 1 Amy    1975     6    27     0  27.5   -79 tropical de…       NA    25     1013
#> # ℹ 2 more variables: tropicalstorm_force_diameter <int>,
#> #   hurricane_force_diameter <int>
getFromNamespace("storms", "dplyr")
#> Error in get(x, envir = ns, inherits = FALSE): object 'storms' not found

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