Create Hash iterating an array of objects

I have an object that has attributes `name` and `data`, among others. I want to create a hash that uses the name as the key and the data (which is an array) as the value. I can't figure out how to reduce the code below using `map`. Is it possible?

def fc_hash
fcs = Hash.new
self.forecasts.each do |fc|
fcs[fc.name] = fc.data
end
fcs
end

With Ruby 2.1 and onward, you could also use `Array#to_h`

self.forecasts.to_h { |forecast| [forecast.name, forecast.data] }

I always use `inject` or `reduce` for this:

self.forecasts.reduce({}) do |h,e|
h.merge(e.name => e.data)
end

Hash[*self.forecases.map{ [fc.name, fc.data]}.flatten]

def fc_hash
forecasts.each_with_object({}) do |forecast, hash|
hash[forecast.name] = forecast.data
end
end

Use [`Hash[]`](

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):

Forecast = Struct.new(:name, :data)
forecasts = [Forecast.new('bob', 1), Forecast.new('mary', 2)]
Hash[forecasts.map{|forecast| [forecast.name, forecast.data]}]
# => {"mary"=>2, "bob"=>1}