tor' with 1 elements:
##  All.males: sex == "Male"
```


---



##Warning: modify-by-reference

Make a copy using `[TRUE]`:

```r
v1 &lt;- validator(check1 = sex == "Male")
v2 &lt;- v1[TRUE]  
names(v2) &lt;- "All males"
v1
```

```
## Object of class 'validator' with 1 elements:
##  check1: sex == "Male"
```

---

class: inverse 

# Exercise 3

We will now add checking for row-wise constraints to our data screening process. 

*   Go through exercise 3 

(Note the last couple of questions in exercise 3 can 