Exercises

• How can you subset only a single character from substr(), e.g. getting the 5th character in hello?
• What happens when you try to subset the 5th character when the string has fewer than 5 characters.
• Is substr() vectorized, i.e. if we pass the column as a vector as the first argument, would the outcome be the same as using the function?
  • What’s the advantage of writing a function?