From: Yohanes Santoso <ysantoso@...>
Date: 2002-01-24T14:35:40+09:00
Subject: Re: Array.last Weirdness

> to print "hello world", but instead I get errors like "undefined method
> `last=' for ["hello"]:Array (NameError)". This doesn't seem too good...

Array.last += " world" resolves to:
Array.last=(Array.last + " world)

But Array.last= is not a built-in method to Array. You've got to
define and includ it yourself. Note that last= has an ambigious
meaning. Do you mean _replace_ or _set_ the last element to something?
The example below assumes replacing the last element.


module XArray
  def last=(obj)
    self.pop
    self.push(obj)
  end
end

class Array
  include XArray
end

a=["hello"]
a.last+=" world"

YS.