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Re: Me no understand scoping
From: |
Jon Wilson |
Subject: |
Re: Me no understand scoping |
Date: |
Sat, 02 Aug 2008 01:13:09 -0400 |
User-agent: |
Thunderbird 2.0.0.16 (X11/20080724) |
Time to trot out the tired old koan [1] ...
Maciek Godek wrote:
which is sad because closures are a very powerful
yet simple mechanism (definitely simpler than what GOOPS or
CLOS have to offer if it comes to OOP -- both in concepts and
implementation)
" The venerable master Qc Na was walking with his student, Anton.
Hoping to
prompt the master into a discussion, Anton said "Master, I have heard that
objects are a very good thing - is this true?" Qc Na looked pityingly at
his student and replied, "Foolish pupil - objects are merely a poor man's
closures."
" Chastised, Anton took his leave from his master and returned to his cell,
intent on studying closures. He carefully read the entire "Lambda: The
Ultimate..." series of papers and its cousins, and implemented a small
Scheme interpreter with a closure-based object system. He learned much, and
looked forward to informing his master of his progress.
" On his next walk with Qc Na, Anton attempted to impress his master by
saying "Master, I have diligently studied the matter, and now understand
that objects are truly a poor man's closures." Qc Na responded by hitting
Anton with his stick, saying "When will you learn? Closures are a poor man's
object." At that moment, Anton became enlightened.
[1] http://people.csail.mit.edu/gregs/ll1-discuss-archive-html/msg03277.html