N00b ? re: CGI Hash and arrays

ruby-talk
1

Hi, n00b here, and got myself stumped on something I thought was easy.

I get CGI params returned as:

params: {"conf_mod"=>["20"], "conf_impact"=>["10"],
"avail_impact"=>["5"], "integrity_impact"=>["5"],
"authorization"=>["5"], "integrity_mod"=>["5"]}

I just want to add up the values in the hash keys. Seems simple, but an
hour or so later, after trying numerous things no go. Any help
appreciated.

#!/usr/bin/ruby

require "cgi"

cgi = CGI.new('html4')
values = cgi.params
#values.each_value { |y| total += (eval y.join('+')) }
#values.each_value { |x| total += x[0] }
#values.each_value do |v| puts v end
#cgi.header
cgi.out() do
    cgi.html() do
      cgi.head{ cgi.title{"TITLE"} } +
      cgi.body() do
        cgi.pre() do
          CGI::escapeHTML(
            "params: " + cgi.params.inspect + "\n"
           "total: " + puts(total) + "\n"
          )
        end
      end
    end
end

···

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2

Hi, n00b here, and got myself stumped on something I thought was easy.

I get CGI params returned as:

params: {"conf_mod"=>["20"], "conf_impact"=>["10"],
"avail_impact"=>["5"], "integrity_impact"=>["5"],
"authorization"=>["5"], "integrity_mod"=>["5"]}

I just want to add up the values in the hash keys. Seems simple, but an
hour or so later, after trying numerous things no go. Any help
appreciated.

So you want to end up with total == 50, right?

The values are arrays of strings, so you need to sum up the (single) values after turning them to integers.

total = 0
values.each_value {|v| v.each {|s| total += s.to_i } }
puts "total: #{total}"

total = 0

=> 0

values.each_value {|v| v.each {|s| total += s.to_i } }

=> {"conf_mod"=>["20"], "conf_impact"=>["10"], "avail_impact"=>["5"], "integrity_impact"=>["5"], "authorization"=>["5"], "integrity_mod"=>["5"]}

puts "total: #{total}"

total: 50
=> nil

-Rob

Rob Biedenharn http://agileconsultingllc.com
Rob@AgileConsultingLLC.com

···

On May 2, 2009, at 4:27 PM, Jeff Leggett wrote:

#!/usr/bin/ruby

require "cgi"

cgi = CGI.new('html4')
values = cgi.params
#values.each_value { |y| total += (eval y.join('+')) }
#values.each_value { |x| total += x[0] }
#values.each_value do |v| puts v end
#cgi.header
cgi.out() do
   cgi.html() do
     cgi.head{ cgi.title{"TITLE"} } +
     cgi.body() do
       cgi.pre() do
         CGI::escapeHTML(
           "params: " + cgi.params.inspect + "\n"
          "total: " + puts(total) + "\n"
         )
       end
     end
   end
end
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3

Jeff Leggett wrote:

Hi, n00b here, and got myself stumped on something I thought was easy.

I get CGI params returned as:

params: {"conf_mod"=>["20"], "conf_impact"=>["10"],
"avail_impact"=>["5"], "integrity_impact"=>["5"],
"authorization"=>["5"], "integrity_mod"=>["5"]}

I just want to add up the values in the hash keys.

The hash keys are the strings: "conf_mod", "conf_impact", etc. The hash
values are the arrays.

Seems simple, but an
hour or so later, after trying numerous things no go. Any help
appreciated.

params = {
  "conf_mod"=>["20"],
  "conf_impact"=>["10"],
  "avail_impact"=>["5"],
  "integrity_impact"=>["5"],
  "authorization"=>["5"],
  "integrity_mod"=>["5"]
}

total = 0

params.each do |key, val|
  num_str = val[0]
  num = num_str.to_i
  total += num
end

puts total

--output:--
50

···

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4

7stud -- wrote:

params.each do |key, val|
  num_str = val[0]
  num = num_str.to_i
  total += num
end

Once you understand that, you can make it briefer:

params.each do |key, val|
  total += val[0].to_i
end

...however if it's possible that the arrays can contain more than one
string, then you need to loop over each array too. As per Rob
Biedenharn's solution:

params = {
  "conf_mod"=>["20", "10"],
  "conf_impact"=>["10"],
  "avail_impact"=>["5", "10"], #<--xtra strings
  "integrity_impact"=>["5"],
  "authorization"=>["5", "10"],
  "integrity_mod"=>["5"]
}

total = 0

params.each do |key, val|

  val.each do |str|
    total += str.to_i
  end

end

puts total

--output:--
80

···

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5

What's with inject?

params.inject(0) {|sum, (key, values)|
  sum + values.inject(0) {|a, b| a + Integer(b)}
}

···

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