CODEWITHSUNDEEP
rubyruby-on-rails-4rubygems
user19671540
user19671540

Reputation:

What each_with_object does in ruby

What each_with_object does? Where it get opts? https://github.com/bodrovis/lokalise_manager/blob/master/lib%2Flokalise_manager%2Ftask_definitions%2Fbase.rb#L23

primary_opts = global_config
                 .singleton_methods
                 .filter { |m| m.to_s.end_with?('=') }
                 .each_with_object({}) do |method, opts|
  reader = method.to_s.delete_suffix('=')
  opts[reader.to_sym] = global_config.send(reader)
end
# *your text*

Tryed to the rear docs on ruby website

Upvotes: 0

Views: 94

Answers (1)

spickermann
spickermann

Reputation: 107067

each_with_object iterates the enumerable in the similar way as each does.

But allows you to pass an additional object to the block (like an empty hash in this example) and it returns that object at the end (and not the iterator as each would do).

This is a simplified example. Instead of

hash = {}
[1, 2, 3].each do |number|
  hash[number] = number * number
end
hash
#=> { 1 => 1, 2 => 4, 3 => 9 }

each_with_object allows you to write:

[1, 2, 3].each_with_object({}) do |number, hash|
  hash[number] = number * number
end
#=> { 1 => 1, 2 => 4, 3 => 9 }

Upvotes: 5

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