Module: Enumerable

Defined in:
lib/rubyc/core_extensions.rb

Instance Method Summary collapse

Instance Method Details

#count_by ⇒ Object 



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# File 'lib/rubyc/core_extensions.rb', line 2

def count_by
  self.inject({}) do |memo, elem|
    key = yield elem
    memo[key] ||= 0
    memo[key] += 1
    memo
  end
end

#group_by ⇒ Object

This method was borrowed from ActiveSupport code



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# File 'lib/rubyc/core_extensions.rb', line 12

def group_by
  self.inject({}) do |memo, elem|
    key = yield elem
    memo[key] ||= []
    memo[key] << elem
    memo
  end
end

#sum(identity = 0, &block) ⇒ Object

File activesupport/lib/active_support/core_ext/enumerable.rb, line 57



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# File 'lib/rubyc/core_extensions.rb', line 22

def sum(identity = 0, &block)
  if block_given?
    map(&block).sum(identity)
  else
    inject { |sum, element| sum + element } || identity
  end
end

#uniq_by ⇒ Object 



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# File 'lib/rubyc/core_extensions.rb', line 30

def uniq_by
  each_with_object({}) do |obj, memo|
    val, data = yield obj
    memo[val] ||= data
  end.values
end