From: Joel VanderWerf <vjoel@...>
Date: 2007-09-16T02:49:27+09:00
Subject: Re: one line to print the statement AS WELL AS the evaluated value like in C

kendear wrote:
> i wonder in Ruby, is there a line method to do something like in C
> 
> 
> print_val("Array[3] + 1")
> 
> and get the printout of
> 
> 
> Array[3] + 1  is   3.345

def dbg(&bl)
   s = yield
   puts "#{s} = #{eval(s, bl).inspect}"
end

array=[0,1,2,3]
dbg{"array[3]+1"}  # ==> array[3]+1 = 4


It seems a little awkward to use both {...} and "..." around the 
expression, but the {} allows the #dbg method to capture the binding of 
the caller.

-- 
        vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407