[R] list of lists, is this element empty

[Ragia Ibrahim]

Hello,
Kindly I have a list of lists as follow
x
[[1]]
[1] 7

[[2]]
[1] 3 4 5

as showen x[[3]] does not have a value and it has NULL, how can I check on this 
how to test if x[[3]] is empty.

thanks in advance
Ragia
 		 	   		  
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