Build an array from array of hashes

Question

I have two Arrays with hashes that looks like below

array_1 = [{"id": "1", "value": "Option_A", default_weight: "50"}, {"id": "2", "value": "Option_B", default_weight: "75"}]

array_2 = [{"id": "2", "value": "Option_B", custom_weight: "35"}]

Now I'm trying build an array which will contain only weights based on the following condition

Pick the default_weight of the object from array_1 if that doesn't exist in array_2. If it exists in array_2, pick custom_weight

The expected output will be [50.0, 35.0]

My failed attempt:

new_array = []
array_1.each do |array_1_item|
  array_2.map {|array_2_item| array_1_item["value"] == array_2_item["value"] ? new_array << array_2_item["custom_weight"].to_f : new_array << array_1_item[:default_weight].to_f}
end

I get [50.0, 50.0, 35.0, 75.0]

Any help is much appreciated, TIA

cschroed · Accepted Answer · 2021-03-28 14:49:21Z

1

Try turning array_2 into a hash first:

custom_weights = {}
array_2.each { |item| custom_weights[item[:value]] = item[:custom_weight] }

Then you can do:

array_1.map { |item| (custom_weights[item[:value]] || item[:default_weight]).to_f }
 => [50.0, 35.0]

answered Mar 28, 2021 at 14:49

cschroed

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