is.empty: Checks if an object is empty (e.g: of zero length)
In installr: Using R to Install Stuff (Such As: R, 'Rtools', 'RStudio', 'Git', and More!)

Description Usage Arguments Details Value Author(s) Source See Also Examples

View source: R/is.x.R

Checks if an object is empty (e.g: of zero length) and returns TRUE/FALSE

1	is.empty(x, mode = NULL, ...)

`x`	an object
`mode`	is the object an empty (zero length) object of this mode (can be "integer", "numeric", and so on...)
`...`	none are available.

Uses identical and avoids any attribute problems by using the fact that it is the empty set of that class of object and combine it with an element of that class.

Returns TRUE/FALSE if the object is empty or not.

James (http://stackoverflow.com/users/269476/james)

http://stackoverflow.com/questions/6451152/how-to-catch-integer0

integer, identical

is.empty(integer(0)) #TRUE
is.empty(0L)         #FALSE
is.empty(numeric(0)) #TRUE
is.empty(NA) # FALSE 
is.empty(FALSE) # FALSE 
is.empty(NULL) # FALSE (with a warning)

a <- which(1:3 == 5)
b <- numeric(0)
is.empty(a)
is.empty(a,"numeric")
is.empty(b)
is.empty(b,"integer")