From: Joel VanderWerf <vjoel@...>
Date: 2002-06-12T01:19:18+09:00
Subject: Re: def +=

Jean-Hugues ROBERT wrote:

> How is that += automatically generated (if at all) ?

Actaully, += is not a method. IIRC x += 1 just syntax sugar for x = x +
1.

If it were a method, what would the receiver be? Normally in Ruby the
receiver of x.foo is the object which is the _value_ of x, but in this
case you want to replace one value with another. In other words, you
need to operate on the variable itself. In Ruby, that can only be done
with assignment, for good reasons.