Why doesn't "case" with "when > 2" work?

Question

Why is this not working?

case ARGV.length   when 0     abort "Error 1"   when > 2     abort "Error 2" end 

Answer 1

It's not valid ruby syntax.

What you need is

case   when ARGV.length == 0     abort "Error 1"   when ARGV.length > 2     abort "Error 2" end 

When you write case x, the important part you need to understand is that ruby takes the x and then applies a comparison to the argument or expressions you insert in the when clause.

The line where you say when x >2 reads to ruby like:

if ARGV.length == > 2 

When you remove a specific object from the case statements, you can apply conditionals within the when statements .