From: gabriele renzi <rff_rff@...>
Date: 2005-01-30T10:15:49+09:00
Subject: Re: Ten Things Every Java Programmer Should Know About Ruby

Navindra Umanee ha scritto:
> Florian Gross <flgr@ccan.de> wrote:
> 
>>Not having your Objects changing types all the time without you 
>>noticing. If you forget to initialize a field in PHP it will be 
>>converted to zero or an empty String if necessary thus shadowing your 
>>bug. Strong typing usually is a requirement for languages where OOP 
>>works well.
> 
> 
> In Ruby, objects pass for different types all the time.  In my own
> recent Ruby code I've mistakenly passed in the wrong types but didn't
> notice because the types responded to the same methods.
> 
> Even though the type didn't change, effectively the problem and bug
> shadowing was identical to the case you describe.

not quite the same.
compare:

method sum(a,b)
  return a+b

strongly typed language:
a='yo'
b=2
sum(a,b) #error

weak typed:
a='yo'
b=2
method sum(a,b) # 2 with 'yo' converted to 0? "yo2" with 2 stringified?

the former has much less potential to hide an error.