From: Avdi Grimm <avdi@...>
Date: 2008-06-14T12:36:13+09:00
Subject: Re: fire event when the value of a variable is changed

On Fri, Jun 13, 2008 at 10:04 PM, fedzor <fedzor@gmail.com> wrote:
> a = 5
> a.trace_var {|new| puts "a was changed to '#{new}'" }

Did you actually try this?  And if so, on what version of Ruby?

According to RI and the results of my own experimentation, trace_var
is called like so:

  trace_var(:$a) {|value| ...}

And it only works for globals, not local variables.


-- 
Avdi

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