'-%>' (minus sign) at the end of a ERb sequence

Question

What\'s the point of using \'-\' (minus sign) at the end of a ERb sequence?

Example:

<% 3.times do -%>
  FooBar

<% end -%>
So         


        

Answer 1

Using a minus sign on the opening or closing part of an erb tag suppresses whitespace before or after the tag on that line.

It was mainly useful when generating things like text/plain emails with erb but like @Simone pointed out, it's now moot.