[RCR] Hash#getopt

ruby-talk
1

<snip>

I'd rather have a class or instance level method that let me define this
behavior globally for all hashes, or locally for instances. That way I
can keep the standard aref syntax, e.g. arg[:key] instead of using a
separate method name. I wouldn't mind a way to ignore case, either.

h = {'foo', 1, 'BAR', 2}
h.symbol_alias = true # or whatever
h.ignore_key_case = true # or whatever

h['foo'] # 1
h[:foo] # 1
h["FOO"] # 1
h['bar'] # 2
... etc, etc.

That being said, I'll take a Hash#getopt method over nothing. :slight_smile:

Regards,

Dan

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···

-----Original Message-----
From: ara.t.howard@noaa.gov [mailto:ara.t.howard@noaa.gov]
Sent: Monday, April 24, 2006 9:17 PM
To: ruby-talk ML
Subject: [RCR] Hash#getopt

at this point calls of the form

   some_method arg, "key" => "value"

or

   some_method arg, :key=>:value

are idiomatic ruby. let's just support it directly and be
done with it:

2

i agreed. the issue though, is that doing that sort of thing globally for
hashes requires a good bit of code to make something like this work

   opts.values_at :key, 'key'

or

   opts_a = {:key => 42}
   opts_b = {'key' => 42.0}

   opts_a.update opts_b

by sticking to access of options only it's possible to provide an easy way to
do the normal thing in 98% of cases. as the above two examples show though, a
more general approach involves making lots of choices about string/symbol
interaction. i actually do this in my own code but it's slippery and not for
general consumption.

regards.

-a

···

On Wed, 26 Apr 2006, Berger, Daniel wrote:

<snip>

I'd rather have a class or instance level method that let me define this
behavior globally for all hashes, or locally for instances. That way I
can keep the standard aref syntax, e.g. arg[:key] instead of using a
separate method name. I wouldn't mind a way to ignore case, either.

h = {'foo', 1, 'BAR', 2}
h.symbol_alias = true # or whatever
h.ignore_key_case = true # or whatever

h['foo'] # 1
h[:foo] # 1
h["FOO"] # 1
h['bar'] # 2
... etc, etc.

That being said, I'll take a Hash#getopt method over nothing. :slight_smile:

--
be kind whenever possible... it is always possible.
- h.h. the 14th dali lama