Check if value == integer(0) in R

Question

I'm using the grep function in R to check if a conditional regular expression is met.

What I have is this: grep(expression, string) where an example might be

   value=  grep("\\s[A-z]", "  ")
   value

which outputs

integer(0)

What I want to be able to do is check is if value == integer(0) and

return TRUE if value is integer(0)

return FALSE if value is not integer(0)

Is there a way to do this in R? If there are alternatives, I am open to them. For example, grep might have an option to output the result as a logical value,

TRUE and FALSE, or

0 and 1 or something related.

If you get integer(0), maybe you can use **length** to judge it. — Vida Wang, Mar 05 '17 at 02:00

score 18 · Accepted Answer · answered Mar 05 '17 at 01:46

You can use identical which is the safe and reliable way to test two objects for being exactly equal (from the docs):

value = integer(0)

identical(value, integer(0))
# [1] TRUE

Or do the following check:

is.integer(value) && length(value) == 0
# [1] TRUE

Check if value == integer(0) in R

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