How to catch integer(0)?

user_322912 0
Viewed 141930

Let's say we have a statement that produces integer(0), e.g.

 a <- which(1:3 == 5)

What is the safest way of catching this?

error-handling r integer try-catch
8 Answers

You can easily catch integer(0) with function identical(x,y)

x = integer(0)
identical(x, integer(0))
[1] TRUE

foo = function(x){identical(x, integer(0))}
foo(x)
[1] TRUE

foo(0)
[1] FALSE
user_150001110

another option is rlang::is_empty (useful if you're working in the tidyverse)

The rlang namespace does not seem to be attached when attaching the tidyverse via library(tidyverse) - in this case you use purrr::is_empty, which is just imported from the rlang package.

By the way, rlang::is_empty uses user Gavin's approach.

rlang::is_empty(which(1:3 == 5))
#> [1] TRUE
user_79411880

isEmpty() is included in the S4Vectors base package. No need to load any other packages.

a <- which(1:3 == 5)
isEmpty(a)
# [1] TRUE
user_98220030
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