Module: Enumerable

Instance Method Summary collapse

Instance Method Details

#as_json(options = nil) ⇒ Object

:nodoc:


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# File 'activesupport/lib/active_support/core_ext/object/json.rb', line 129

def as_json(options = nil) #:nodoc:
  to_a.as_json(options)
end

#exclude?(object) ⇒ Boolean

The negative of the Enumerable#include?. Returns true if the collection does not include the object.

Returns:

  • (Boolean)

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# File 'activesupport/lib/active_support/core_ext/enumerable.rb', line 61

def exclude?(object)
  !include?(object)
end

#index_byObject

Convert an enumerable to a hash.

people.index_by(&:login)
  => { "nextangle" => <Person ...>, "chade-" => <Person ...>, ...}
people.index_by { |person| "#{person.first_name} #{person.last_name}" }
  => { "Chade- Fowlersburg-e" => <Person ...>, "David Heinemeier Hansson" => <Person ...>, ...}

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# File 'activesupport/lib/active_support/core_ext/enumerable.rb', line 35

def index_by
  if block_given?
    Hash[map { |elem| [yield(elem), elem] }]
  else
    to_enum(:index_by) { size if respond_to?(:size) }
  end
end

#many?Boolean

Returns true if the enumerable has more than 1 element. Functionally equivalent to enum.to_a.size > 1. Can be called with a block too, much like any?, so people.many? { |p| p.age > 26 } returns true if more than one person is over 26.

Returns:

  • (Boolean)

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# File 'activesupport/lib/active_support/core_ext/enumerable.rb', line 47

def many?
  cnt = 0
  if block_given?
    any? do |element|
      cnt += 1 if yield element
      cnt > 1
    end
  else
    any? { (cnt += 1) > 1 }
  end
end

#pluck(*keys) ⇒ Object

Convert an enumerable to an array based on the given key.

[{ name: "David" }, { name: "Rafael" }, { name: "Aaron" }].pluck(:name)
  => ["David", "Rafael", "Aaron"]

[{ id: 1, name: "David" }, { id: 2, name: "Rafael" }].pluck(:id, :name)
  => [[1, "David"], [2, "Rafael"]]

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# File 'activesupport/lib/active_support/core_ext/enumerable.rb', line 83

def pluck(*keys)
  if keys.many?
    map { |element| keys.map { |key| element[key] } }
  else
    map { |element| element[keys.first] }
  end
end

#sum(identity = nil, &block) ⇒ Object

Calculates a sum from the elements.

payments.sum { |p| p.price * p.tax_rate }
payments.sum(&:price)

The latter is a shortcut for:

payments.inject(0) { |sum, p| sum + p.price }

It can also calculate the sum without the use of a block.

[5, 15, 10].sum # => 30
['foo', 'bar'].sum # => "foobar"
[[1, 2], [3, 1, 5]].sum => [1, 2, 3, 1, 5]

The default sum of an empty list is zero. You can override this default:

[].sum(Payment.new(0)) { |i| i.amount } # => Payment.new(0)

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# File 'activesupport/lib/active_support/core_ext/enumerable.rb', line 20

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

#without(*elements) ⇒ Object

Returns a copy of the enumerable without the specified elements.

["David", "Rafael", "Aaron", "Todd"].without "Aaron", "Todd"
  => ["David", "Rafael"]

{foo: 1, bar: 2, baz: 3}.without :bar
  => {foo: 1, baz: 3}

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# File 'activesupport/lib/active_support/core_ext/enumerable.rb', line 72

def without(*elements)
  reject { |element| elements.include?(element) }
end