R object of data.frame and data.table have same type?

Question

I am still very new to R and recently came across something I am not sure what it means. data.frame and data.table have same type? Can an object ha

Answer 1

Data.table and data.frame are different classes, but they are related through inheritance. Data.table inherits from data.frame, and basically expands its capabilities. You can also see that after converting cars to the data.table class:

R> typeof(cars)
[1] "list"      # similar to dataframe

R> mode(cars)
[1] "list"      # idem

More information here or just google for "inheritance".