General utility functions — compact • arcgisutils

General utility functions

Usage

compact(.x)

a %||% b

check_dots_named(dots, call = rlang::caller_env())

Arguments

.x: a list
a: an R object
b: an R object
dots: a list collected from dots via rlang::list2(...)
call: default rlang::caller_env(). The caller environment passed to cli::cli_abort()

Value

compact() a list
%||% the first non-null item or NULL if both are NULL

Details

compact() removes any NULL list elements
%||% is a special pipe operator that returns b if a is NULL

Examples


# remove null elements
compact(list(a = NULL, b = 1))
#> $b
#> [1] 1
#> 

# if NULL return rhs
NULL %||% 123
#> [1] 123

# if not NULL return lhs
123 %||% NULL
#> [1] 123