From: Dave Thomas <Dave@...>
Date: 2001-07-13T05:41:00+09:00
Subject: [ruby-talk:17752] Re: What is Array#- ?

Jim Freeze <jim@freeze.org> writes:

> irb(main):003:0> a=%w{1 1 2 2 3 3 3}
> ["1", "1", "2", "2", "3", "3", "3"]
> irb(main):004:0> a-["3"]
> ["1", "2"]
> 
> This looks like this is really the minus operation mixed with the
> uniq operation.
> 
> a1 - a2 => a1.uniq - a2.uniq
> or maybe
> a1 - a2 => (a1-a2).uniq
> 
> Someone care to explain this behavior?

Forgive the doubled minus sign - wee LaTeX -> HTML conversion
problem. However:

http://www.rubycentral.com/book/ref_c_array.html#_mi_mi


Dave