# Types / Class & packages x

Its good practice to check that you are dealing with

## How do you check an object type?

 you should use a *class* function(). here are some examples

```r
x <- 2
class(x)
# should display "numeric"

y <- "2"
class(y)
# should display "character"
```

## the classic types

### data frames

### xml\_document

## advanced types


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