Passing strings as arguments in dplyr verbs

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I would like to be able to define arguments for dplyr verbs

filter1<- "!is.na(attend)" 
filter2<- "is.na(attend)" 

and then use these strings in dply functions :

ds1<- ds %>% 
  filter(eval(cat(filter2))) 
ds2<- ds %>% 
  filter(eval(cat(filter1))) 

But it throws in error

!is.na(attend)
Error: filter condition does not evaluate to a logical vector. 

How to pass a string as an argument in a dplyr verb?

asked 49 secs ago

andrey

160