formating / traversing hash

[Tony]

given a hash of keys => values, I want to construct a conditional statement that the hash describes, in the form "a = b AND c = d", etc. So far I've came up with

code:

irb(main):001:0> foo = {"a"=>"b","c"=>"d"} => {"a"=>"b", "c"=>"d"} irb(main):002:0> bar = "" => "" irb(main):003:0> foo.each{|key, value| irb(main):004:1* bar = "#{bar} #{key} = #{value} AND" } => {"a"=>"b", "c"=>"d"} irb(main):005:0> bar.slice!(0..-4) => " a = b AND c = d "

which seems like a pretty ugly solution. I especially don't like that last hack on a leftover "AND". Is there a more eligant approach?

While #collect gives me a nice array

code:

irb(main):007:0> foo.collect => [["a", "b"], ["c", "d"]]

the #join acts as if the array was flattened

code:

irb(main):006:0> foo.collect.join("*") => "a*b*c*d"

[wtd]

What happens if you pass a block to collect?

[Tony]

code:

irb(main):025:0> bar = foo.collect{|a| a.join("=")}.join(" AND ") => "a=b AND c=d"

excellent question, thank you

[wtd]

Tony wrote:

code:

irb(main):025:0> bar = foo.collect{|a| a.join("=")}.join(" AND ") => "a=b AND c=d"

excellent question, thank you

You're welcome, though I would have said:

code:

foo.collect { |k, v| "#{k} = #{v}" }.join(" AND ")