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Ternary operator in R
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| ``` r | |
| `?` <- function(x, y) { | |
| y <- substitute(y) | |
| if (!is.call(y) || !identical(as.symbol(":"), y[[1]])) stop("Invalid", call. = FALSE) | |
| eval(call("if", x, y[[2]], y[[3]])) | |
| } | |
| T ? 1 | |
| #> Error: Invalid | |
| T ? 1 : 2 | |
| #> [1] 1 | |
| F ? 1 : 2 | |
| #> [1] 2 | |
| ``` |
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