Module: EnumerableWithArgs

Included in:
Interval
Defined in:
lib/carat/enumerable-args.rb

Overview

EnumerableWithArgs

This is a simple reimplementation of the core Enumerable module to allow the methods to take and pass-on arbitrary arguments to the underlying #each call.

Synopsis

require 'carat/enumerable-args'

class T
  include Enumerable
  def initialize(arr)
    @arr = arr
  end
  def each(n)
    arr.each{ |e| yield(e+n) }
  end
end

t = T.new([1,2,3])
t.collect(4)
#=> [5,6,7]

Note

The #sort method still needs to be done.

Copyright (c) 2004 Thomas Sawyer, Pancakes License

History

$Id: enumerable.rb,v 1.0 2004/11/30 transami Exp $

Instance Method Summary collapse

Instance Method Details

#collect(*args) ⇒ Object Also known as: map

:yield:



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# File 'lib/carat/enumerable-args.rb', line 43

def collect(*args)  # :yield:
  a = []
  each(*args){ |n| a << yield(n) }
  a
end

#detect(*args) ⇒ Object Also known as: find

:yield:



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# File 'lib/carat/enumerable-args.rb', line 50

def detect(*args)  # :yield:
  each(*args){ |n| return n if yield(n) }
  nil
end

#each_slice(*args, &yld) ⇒ Object Also known as: each_by

An additional method not part of standard Enumerable. The regular version of this method can be found in Facets, but it is a bit more advanced then this one. At some point they need to be put into sync.



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# File 'lib/carat/enumerable-args.rb', line 74

def each_slice(*args, &yld)
  a = []; s = []
  ar = yld.arity.abs
  each(*args){ |n|
    s << n
    if s.length >= ar
      yld.call(*s)
      s = []
    end
  }
  a
end

#grep(pattern, *args) ⇒ Object 



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# File 'lib/carat/enumerable-args.rb', line 95

def grep(pattern, *args)
  a = []
  each(*args){ |n| a << (block_given? ? yield(n) : n) if pattern === n }
  a  
end

#include?(anObj, *args) ⇒ Boolean Also known as: member?

Returns:

  • (Boolean) 


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# File 'lib/carat/enumerable-args.rb', line 101

def include?(anObj, *args)
  each(*args){ |n| return true if anObj == n }
  false
end

#max(*args) ⇒ Object 



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# File 'lib/carat/enumerable-args.rb', line 107

def max(*args)
  to_a(*args).max
end

#min(*args) ⇒ Object 



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# File 'lib/carat/enumerable-args.rb', line 111

def min(*args)
  to_a(*args).min
end

#reject(*args) ⇒ Object 



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# File 'lib/carat/enumerable-args.rb', line 115

def reject(*args)
  a = []
  each(*args){ |n| a << n if ! yield(n) }
  a
end

#select(*args) ⇒ Object Also known as: find_all

:yield:



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# File 'lib/carat/enumerable-args.rb', line 88

def select(*args)  # :yield:
  a = []
  each(*args){ |n| a << n if yield(n) }
  a
end

#sort(*args) ⇒ Object 



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# File 'lib/carat/enumerable-args.rb', line 121

def sort(*args)
  # TODO
end

#to_a(*args) ⇒ Object Also known as: entries

problematic for multiple arity on block def each_with_index(*args)

i=0
each(*args){ |n,i| yield(n); i+=1 }
self

end



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# File 'lib/carat/enumerable-args.rb', line 63

def to_a(*args)
  a = []
  each(*args){ |n| a << n }
  a
end