Initialize Struct from array keys

Question

I have

arrs = [[:key1, key2, key3, key4],[:key6, key7]]

And I want to define Struct by using those keys like this:

arrs.map do |arr|
  Struct.new(arr)
end

but it does raise an error:

TypeError: no implicit conversion of Array into String
    from (irb):26:in `new'
    from (irb):26

So, do we have any way to initialize these keys in Struct?

Your question is unclear. What do you want the result of your code to be? What does test have to do with it? Why are you assigning to test and then never ever using the result? — Jörg W Mittag
– Jörg W Mittag, Commented Mar 21, 2017 at 18:41

Ilya · Accepted Answer · 2017-03-21 16:26:55Z

4

Use the splat operator:

arrs = [[:key1, :key2, :key3, :key4],[:key6, :key7]]
arrs.map { |a| Struct.new(*a) }
=> [#<Class:0x007fa833e25738>, #<Class:0x007fa833e1fa18>]

answered Mar 21, 2017 at 16:26

Ilya

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