Do you remember that when you added 5 + "six", you got an error due to a mismatch in data types? You can avoid such embarrassing situations by checking the data type of a variable beforehand. You can do this with the class() function, as the code on the right shows.
# Declare variables of different types
my_numeric <- 42
my_character <- "universe"
my_logical <- FALSE
# Check class of my_numeric
class(my_numeric)
# Check class of my_character
class(my_character)
# Check class of my_logical
class(my_logical)
> # Declare variables of different types
> my_numeric <- 42
> my_character <- "universe"
> my_logical <- FALSE
>
> # Check class of my_numeric
> class(my_numeric)
[1] "numeric"
>
> # Check class of my_character
> class(my_character)
[1] "character"
>
> # Check class of my_logical
> class(my_logical)
[1] "logical"
Complete the code in the editor and also print out the classes of my_character and my_logical.
First understand the algorithm carefully. Then study the program line-by-line and compare it with the output. Finally, review the explanation section to strengthen your logic and programming understanding.
Rewrite the program without looking at the code. Modify values, conditions or logic and run it again. This helps improve confidence and strengthens coding skills much faster.