Hello,
Using the R.oo package, how do I throw an error if a field is not present
when the user of the class creates the object?
Using the example in the R.oo package:
setConstructorS3("Person", function(name, age) {
if (missing(name)) name <- NA;
if (missing(age)) age <- NA;
extend(Object(), "Person",
.name=name,
.age=age
)
})
[rest of class methods here...etc...]
User types this with no issues because both age and name are there:
p1 <- Person("Dalai Lama", 67)
User types this and I want it to throw an error because the age field is
missing:
p1 <- Person("Dalai Lama")
Link to the example I am drawing from:
http://127.0.0.1:22346/library/R.oo/html/Object.html
I know how to throw an error when a method is used. I want to throw an error
when the object is created.
I've tried print and cat statements in the Constructor section and after the
extend statement.
Thanks,
Ben
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