Class: Array

Inherits:
Object
  • Object
show all
Defined in:
lib/roqua/core_ext/array/stable_sort_by.rb

Instance Method Summary collapse

Instance Method Details

#stable_sort_by ⇒ Object

Method for stably sorting elements in an array on multiple attributes.

  • Pass the method a block with two arrays containing the attributes for which the elements should be subsequently sorted. The first attribute is applied last. If for some attribute the sort order should be reversed, the parameters x and y can be exchanged between the arrays.

Example

my_array.stable_sort_by{|x, y| [
                         x.attribute1,
                         y.attribute2,
                         y.attribute3,
                         y.attribute4
                       ] <=> [
                         y.attribute1,
                         x.attribute2,
                         x.attribute3,
                         x.attribute4
                       ]}



22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
 
# File 'lib/roqua/core_ext/array/stable_sort_by.rb', line 22

def stable_sort_by
  sort do |x, y|
    if not x
      -1
    elsif not y
      1
    else
      if block_given?
        yield x, y
      else
        x <=> y
      end
    end
  end
end