Module: Enumerable

Defined in:
lib/ext/enumerable.rb

Instance Method Summary collapse

Instance Method Details

#average ⇒ Object Also known as: mean, avg 



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# File 'lib/ext/enumerable.rb', line 31

def average
  sum/size
end

#map_with_index(&block) ⇒ Object 



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# File 'lib/ext/enumerable.rb', line 2

def map_with_index(&block)
  val = []
  self.each_with_index { |e, i| val << yield(e, i) }
  val
end

#map_with_index!(&block) ⇒ Object 



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# File 'lib/ext/enumerable.rb', line 8

def map_with_index!(&block)
  self.each_with_index do |e, i|
    val = yield(e, i)
    self[i] = val
  end
end

#max_position ⇒ Object 



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# File 'lib/ext/enumerable.rb', line 48

def max_position
  mp = [nil, nil]
  each_with_index do |e, i|
    mp = e, i unless mp.first
    mp = e, i if e > mp.first
  end
  mp.last
end

#min_position ⇒ Object

Returns the position (or first position) of the minimal value. So, [3,2,1,4,5,0].min_position is 5



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# File 'lib/ext/enumerable.rb', line 39

def min_position
  mp = [nil, nil]
  each_with_index do |e, i|
    mp = e, i unless mp.first
    mp = e, i if e < mp.first
  end
  mp.last
end

#scale_with(ary) ⇒ Object

Expects an array of scalars



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# File 'lib/ext/enumerable.rb', line 16

def scale_with(ary)
  val = []
  self.map_with_index { |e, i| val << e * ary[i] }
  val
end

#scale_with!(ary) ⇒ Object 



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# File 'lib/ext/enumerable.rb', line 22

def scale_with!(ary)
  self.map_with_index! { |e, i| e * ary[i] }
end

#sum ⇒ Object 



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# File 'lib/ext/enumerable.rb', line 26

def sum
  val = any? {|e| e.is_a?(Float)} ? 0.0 : 0
  self.inject(val) {|s, e| s += e}
end