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Re: Help on hashing multiple keys and values

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Adam Adam wrote in post #992620:
> I'm trying to create a hash with multiple values per key from a tab
> delimited file. numbers_and_colors.txt example:
>

>The idiom I use is to add an array to hold the values, like this:

>(name_hash[key] ||= []) << value

  hi adam -

  i do what clifford does, but since i'm thick-headed i do it a bit more
verbosely (is that a word?)...

foo = Hash.new{|key, value| key[value] = []}

  this sets up a hash, where each key's value is an array (you can also
get all crazy, and make each value a hash...)  once you've got that set,
play around with this kind of stuff...

foo ["rays"] = %W[alpha beta gamma]
foo ["planets"] = %W[mercury venus earth mars]
foo ["colors"] = %W[red orange yellow green blue indigo violet]

p foo
p foo.length
p foo ["rays"][1]
p foo ["planets"][-1]
p foo ["colors"].length


 - j

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Help on hashing multiple keys and values Adam Adam <adam_sateriale@yahoo.com> - 2011-04-13 18:33 -0500
  Re: Help on hashing multiple keys and values Clifford Heath <no@spam.please.net> - 2011-04-14 09:36 +1000
  Re: Help on hashing multiple keys and values jake kaiden <jakekaiden@yahoo.com> - 2011-04-13 18:59 -0500
  Re: Help on hashing multiple keys and values Adam Adam <adam_sateriale@yahoo.com> - 2011-04-13 19:46 -0500
    Re: Help on hashing multiple keys and values Clifford Heath <no@spam.please.net> - 2011-04-14 11:15 +1000
      Re: Help on hashing multiple keys and values jake kaiden <jakekaiden@yahoo.com> - 2011-04-13 21:05 -0500
  Re: Help on hashing multiple keys and values jake kaiden <jakekaiden@yahoo.com> - 2011-04-13 20:37 -0500
  Re: Help on hashing multiple keys and values Adam Adam <adam_sateriale@yahoo.com> - 2011-04-13 21:13 -0500
  Re: Help on hashing multiple keys and values "WJ" <w_a_x_man@yahoo.com> - 2011-04-17 16:30 +0000

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