From: Pieter Hugo <pieter@...>
Date: 2009-11-24T23:46:28+09:00
Subject: Difference between << and += for Strings and Arrays. Bug?

Hi
I have been programming with Ruby for about 1 year and am loving it. I
cam across something that I can't figure out why it works the way it
does:

Eg:
a=[1,2]
b=a
b << 3

The value of b is now [1,2,3], but the value of a is also [1,2,3]????
And yet:

a=[1,2]
b=a
b += [3]

The value of b is still [1,2,3] but a remains [1,2]. This just doesnt
make sense to. The same happens with Strings. Why would the append
operator (<<) change the original variable, but other operators dont
seem to. PS What I really want to know is why the original variable is
changed at all?
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