Paul L. Snyder on 4 Jan 2016 08:42:22 -0800

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[PLUG] [plug-announce] *CORRECTION* Wed, Jan 6, 2016: PLUG Central - "The Historical 'How' and 'Why' of Hash Tables" by Mark Jason Dominus (7pm at USP)

...And that date should be, of course, Wednesday, January *6*.
Happy New Year!

On Mon, 04 Jan 2016, Paul L. Snyder wrote:

> PLUG Central will be meeting on Wednesday, January 6, at USP in 
> Philadelpha, beginning at 7pm. Directions to the meeting location 
> at the University of the Sciences in Philadelphia can be found at 
> the end of this email. 
> This month's meeting features a talk by Mark Jason Dominus. Mark
> is well-known as the author of _Higher-Order Perl_, among his other
> accomplishments.
> Mark has been a regular speaker at PLUG, giving a winter talk
> for twelve of the last fifteen years.  This year's topic will be
> "The Historical 'How' and 'Why' of Hash Tables".
>   Hash tables, dictionaries, and other associative data
>   structures are so ubiquitous in modern programming languages
>   that we can forget that at one time they were fresh and
>   innovative. How did we live without them? Not too well, as I
>   will describe.
>   I will explain how hashes work in general and compare the
>   implementations in the Perl and Python programming
>   languages. I'll also discuss the non-hash implementation of
>   similar language features in the earlier languages Lisp
>   (1960ish) and SNOBOL (1965ish).
>   This talk will be suitable for:
>       people who have never heard of a hash table
>       people who know what it is but not how it works
>       people who know how it works but are interested in history 
> The meeting will be held at our usual location: 
> University of the Sciences in Philadelphia (USP) 
> Griffith Hall (Room "C" or "A", look for the signs) 
> 600 South 43rd Street 
> Philadelphia, PA 19104-4495 
> USP is located in University City. Driving directions are 
> available at, or 
>, both of which have an aerial 
> view of the campus buildings. USP is also easily accessible by 
> public transportation. 
> There will be an open Question & Answer session at 7PM, prior to 
> the main presentation at 8PM. This is an open meeting; all are 
> welcome and encouraged to attend. 
> Usually, a number of members get together after the meeting at a 
> nearby restaurant for food and perhaps a beer or two. Come join 
> the camaraderie! 
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