You've seen the Ruby if statement before:
if condition
# Do something!
end
If the "do something" is a short, simple expression, however, we can move it up into a single line (as you saw in the last exercise). The syntax looks like this:
expression if boolean
Ruby will expect an expression followed by if followed by a boolean. The order is important. You can do this:
puts "It's true!" if true
but not this:
if true puts "It's true!"
It's also important to note that you don't need an end when you write your if statement all on one line.