From: Brian Candler <lists@...>
Date: 2012-09-07T04:26:21+09:00
Subject: Re: Subtraction, union and intersection of arrays in Ruby

Joao Silva wrote in post #1074949:
> Here is a little tricky, and not calculated well

it doesn't even *parse*:

$ ruby ert.rb
ert.rb:5: syntax error, unexpected '!', expecting kEND
     op_sys if [i]! = linux_sys [i]
                   ^
ert.rb:6: syntax error, unexpected '=', expecting kEND
            subtraction = [i] = op_sys [i]
                               ^
ert.rb:8: syntax error, unexpected kEND, expecting $end

First make your program syntactically valid. Then you can see if it 
works or not.

Note: the error message "unexpected kEND, expecting $end" is not a very 
good message. What it should say is "unexpected 'end', was expecting 
end-of-file"

That is, there is one too many 'ends' in your program.

Hint: a statement like

  foo if bar == baz

is a single complete statement. It does *not* want a matching 'end' 
statement. It means "if bar == baz, do foo"

But if you write it the other way:

  if bar == baz
    foo
  end

this means the same, but *does* have a matching 'end' statement.

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