Created
January 15, 2020 11:30
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| library(dplyr) | |
| data(mtcars) | |
| filter_a <- TRUE; filter_b <- TRUE; filter_c <- TRUE | |
| ### Variant 1 ### | |
| d <- mtcars | |
| if (filter_a) d <- filter(d, am == 0) | |
| if (filter_b) d <- filter(d, hp > 10) | |
| if (filter_c) d <- filter(d, cyl == 4) | |
| ### Variant 2 ### | |
| call <- quote(filter(mtcars)) | |
| call | |
| #> filter(mtcars) | |
| call[[1]] | |
| #> filter | |
| call[[2]] | |
| #> mtcars | |
| if (filter_a) call[[length(call)+1]] <- quote(am == 0) | |
| if (filter_b) call[[length(call)+1]] <- quote(hp > 10) | |
| if (filter_c) call[[length(call)+1]] <- quote(cyl == 4) | |
| call | |
| #> filter(mtcars, am == 0, hp > 10, cyl == 4) | |
| all(eval(call) == d) | |
| #> [1] TRUE |
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