I'm trying to create some arrays in some threads and name them after a fixnum between 1 and 30 like the following:
times = 30 n=0 thread = [] while n < times thread << Thread.new(n) {|x| array#{x} = Array.new() ... } end How can I do that?
- This is definitely a time to consider what you are doing and why. Variable names are for humans. The computer doesn't care (and will munge the name you give it). Store this information in a collection(Array, Hash...). An array even has the benefit of number based index's, which seems to be what you want to do.quandrum– quandrum2012-12-29 23:02:17 +00:00Commented Dec 29, 2012 at 23:02
- thanks for suggestion. I don't mean to do that in purpose but didn't realize there's a way as you and gmalette addressed.pbronze– pbronze2012-12-30 03:49:16 +00:00Commented Dec 30, 2012 at 3:49
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2 Answers
Ruby does not allow you to create variable names from strings in the same way that PHP does. In a case such as this you could use an array or a hash instead.
times = 30 n=0 arrays = [] thread = [] while n < times thread << Thread.new(n) {|x| arrays[x] = Array.new() ... } end You can also use more rubyish constructs instead of while, such as Fixnum#times.
arrays = [] threads = 30.times.map do |n| Thread.new do arrays[x] = Array.new # ... end end > arrays #=> [[], [], [], ....] > threads #=> [#<Thread:0x007fe3f22a2320 dead>, #<Thread:0x007fe3f22a2208 dead>, ...] 
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pbronze
thanks for giving out the code. And yes, I should work on how to think in ruby way :)
If you don't mind using instance variables rather than local variables, you can do what you are trying to do (whether it is a good idea to design code in this way is another question).
1.upto(times) do |i| instance_variable_set("@array#{i}".to_sym, []) end 