From: Bil Kleb <Bil.Kleb@...>
Date: 2006-08-15T06:50:09+09:00
Subject: Re: A use case for an ordered hash

Hal Fulton wrote:
> There have been numerous occasions when I wanted an
> ordered hash, but usually I can't remember to write
> them down.

Here's my latest one[1]:

I had a string with a bunch of tagged "tolerance fields",
e.g., >>1+/-10% 'tag'<< (a mini DSL?).  Based on some sort
of distribution function, e.g., uniform or Gaussian,
I generated an array of samples for each tagged field.
A regular hash was a perfect fit,

   samples[tag] = [ sample1, sample2, .. ]

*until* another requirement came up: to present the tags
in order of appearance.

Later,
--
Bil
http://fun3d.larc.nasa.gov

[1] Part of a CEV (Crew Exploration Vehicle) task