Write an expression the evaluates to the concatenation of the
    strings 'foo' and 'bar'.
  
    What is the value of 'foo'[0]?
  
    What is the value of 'foo'.length?
  
    What is the value of 'foo\nbar'.length?
  
    What is the value of 'foo\\nbar'.length?
  
    What is the value of 'foo'['foo'.length - 1]?
  
    What is the value of 'foo'.toUpperCase()?
  
    What is the value of 'FOO'.toLowerCase()?
  
    Write an expression the evaluates to the concatenation of the values of the
    string variables s1 and s2.
  
    Write an expression the evaluates to the first character of the value of the
    string variable s.
  
    Write an expression the evaluates to a string containing all but the first
    character of the string in variable s.
  
    Write an expression the evaluates to a string containing the first three
    character of the string in variable s.
  
    Write an expression the evaluates to a string containing all but the first
    and last character of the string in variable s.
  
    Write an expression the evaluates to a string containing the last three
    character of the string in variable s.
  
    Write an expression the evaluates to the the value of the string
    variable s with the first letter capitalized and the remaining
    letters in lower case.
  
    Write an expression the evaluates to the the value of the string
    variable s with the first three letters capitalized and the
    remaining letters in lower case.