I have no idea if someone hacked something like this already, i tried
searching with google but it’s hard to type good keys … anyway here’s
what i wrote for SOAP4R that had LOTS of instance variables that i
already had in hash and wanted eay way to assign them.
this should work for almost every class and should provide nice and easy
way to assigning values to instance variables in hash-like way.
of course it exposes all instance variables so encuspulaction (or
whatever you spell it) goes flying out of window.
module ActAsHash
def
self.instance_variable_get(("@"+index.to_s).to_sym)
end
def []=(index,value)
self.instance_variable_set(("@"+index.to_s).to_sym, value)
end
def from_hash(hash)
hash.each_pair do |k,v|
self[k]=v
end
end
end
and use it simply like
class A
include ActAsHash
attr_accessor :foo
end
a = A.new
a[“foo”] = :bar
a.foo => :bar
a[:foo] => :bar
i hope it’s usefull for someone 
mayby it can find place in Facets 
Marcin R. wrote:
self.instance_variable_get(("@"+index.to_s).to_sym)
ISTR that “@”+index.to_s is slower than “@#{index}”.
Also, you don’t need to call #to_sym. The string is enough.
Joel VanderWerf wrote:
Marcin R. wrote:
self.instance_variable_get(("@"+index.to_s).to_sym)
ISTR that “@”+index.to_s is slower than “@#{index}”.
i think concantation is faster then creating new one and i have no idea
what ISTR mean
Also, you don’t need to call #to_sym. The string is enough.
yep that’s true 
i didn’t know that.
thanks for fixes
Marcin R. wrote:
Joel VanderWerf wrote:
Marcin R. wrote:
self.instance_variable_get(("@"+index.to_s).to_sym)
ISTR that “@”+index.to_s is slower than “@#{index}”.
i think concantation is faster then creating new one and i have no idea
what ISTR mean
Eh. It’s not as much as I remembered:
require ‘benchmark’
Benchmark.bmbm(12) do |bm|
n = 1_000_000
index = “foo”
@foo = 123
bm.report(’"@"+index.to_s’) do
n.times do
instance_variable_get("@"+index.to_s)
end
end
bm.report(’"@#{index}"’) do
n.times do
instance_variable_get("@#{index}")
end
end
end
END
Rehearsal --------------------------------------------------
“@”+index.to_s 1.170000 0.010000 1.180000 ( 1.178025)
“@#{index}” 0.960000 0.000000 0.960000 ( 0.954115)
----------------------------------------- total: 2.140000sec
user system total real
“@”+index.to_s 1.170000 0.000000 1.170000 ( 1.174559)
“@#{index}” 0.940000 0.000000 0.940000 ( 0.945398)
ISTR that ISTR means I seem to recall, but I might be wrong 
mayby it can find place in Facets 