Class: Enumerator

Inherits:
Object show all
Defined in:
lib/core/facets/to_hash.rb,
lib/core/facets/enumerator.rb,
lib/core/facets/enumerator/fx.rb

Direct Known Subclasses

Denumerator

Defined Under Namespace

Classes: Yielder

Instance Method Summary collapse

Constructor Details

#initialize(*args, &block) ⇒ Enumerator (private)

Provides the ruby-1.9 block form of Enumerator, where you can write:

obj = Enumerator.new do |yielder|
  # ...
  yielder.yield(data)  # or: yielder << data
  # ...
end

When obj.each is called, the block is run once. It should call yielder.yield with each item it wishes to generate.

Example:

fib = Enumerator.new { |y|
  a = b = 1
  loop {   
    y << a
    a, b = b, a + b
  }
}  

fib.take(10)  #=> [1, 1, 2, 3, 5, 8, 13, 21, 34, 55]



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# File 'lib/core/facets/enumerator.rb', line 37

def initialize(*args, &block)
  if block
    @body = block
    old_initialize(self, :_start)
  else
    old_initialize(*args)
  end
end

Instance Method Details

#_start(*args, &receiver) ⇒ Object (private)

:nodoc:



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# File 'lib/core/facets/enumerator.rb', line 46

def _start(*args,&receiver) #:nodoc:
  @body.call(Yielder.new(&receiver), *args)
end

#fx ⇒ Object 



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# File 'lib/core/facets/enumerator/fx.rb', line 15

def fx
  Functor.new(&method(:fx_send).to_proc)
end

#fx_send(op, *a, &b) ⇒ Object (private) 



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# File 'lib/core/facets/enumerator/fx.rb', line 22

def fx_send(op, *a, &b)
  map{ |e| e.send(op, *a, &b) }
end

#old_initialize ⇒ Object (private) 



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# File 'lib/core/facets/enumerator.rb', line 12

alias :old_initialize :initialize

#to_h(mode = nil) ⇒ Object

Convert an Enumerator object into a hash. This is equivalent to Array#to_h.

e1 = [[1,:a],[2,:b],[3,:c]].to_enum
e1.to_h #=> { 1=>:a, 2=>:b, 3=>:c }

e2 = [1,2,3,4,5].to_enum
e2.to_h  #=> {5=>nil, 1=>2, 3=>4}

e3 = [1,2,1,3,1,5].to_enum
e3.to_h #=> {1=>5}

CREDIT: Sandor Szücs



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# File 'lib/core/facets/to_hash.rb', line 289

def to_h(mode=nil)
  to_a.to_h(mode)
end

#to_h_assoc ⇒ Object

This is equivalent to Array#to_h_assoc.



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# File 'lib/core/facets/to_hash.rb', line 313

def to_h_assoc
  to_a.to_h_assoc
end

#to_h_auto ⇒ Object

This is equivalent to Array#to_h_auto.



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# File 'lib/core/facets/to_hash.rb', line 295

def to_h_auto
  to_a.to_h_auto
end

#to_h_flat ⇒ Object

This is equivalent to Array#to_h_flat.



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# File 'lib/core/facets/to_hash.rb', line 307

def to_h_flat
  to_a.to_h_flat
end

#to_h_multi ⇒ Object

This is equivalent to Array#to_h_multi.



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# File 'lib/core/facets/to_hash.rb', line 319

def to_h_multi
  to_a.to_h_multi
end

#to_h_splat ⇒ Object

This is equivalent to Array#to_h_splat.



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# File 'lib/core/facets/to_hash.rb', line 301

def to_h_splat
  to_a.to_h_splat
end