Convert a hash to set and divide : Set « Collections « Ruby






  1. Ruby
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  3. Set

Convert a hash to set and divide


require 'set'
connections = { 1 => 2, 2 => 3, 3 => 1, 4 => 1 }
[1,2,3,4].to_set.divide { |x,y| connections[x] == y }
# => #<Set: {#<Set: {1, 2, 3}>, #<Set: {4}>}>








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3.Is it in a set
4.Is it a subset
5.Set length, size and empty?
6.The intersection is the set of values that appear in both
7.The union is the set of values that appear in either
8.a-b: is the elements of a except for those also in b
9.a^b is the set of values that appear in one set but not both: (a|b)-(a&b)
10.Add element to a set
11.merge a range to a set
12.Remove elements from a set
13.Set subtraction
14.Delete elements from a set with block
15.Reject elements from a set
16.Do an in-place intersection like this:
17.Replace a set
18.Clear a set
19.Is it empty
20.Each loop
21.Map elements in a set
22.Collect in place
23.Convert set to array
24.Inspect a set
25.Compare two sets
26.Classify set elements as even or odd
27.Divide set
28.Divide with block
29.Flatten the subsets
30.Add new method to set
31.Partitioning or Classifying a Set
32.Divide a set by value
33.Divide a set by even and odd value
34.Divide a set by its element's class
35.Divide a set by absolute value
36.Divide set into three sub sets
37.Classify a set into three
38.Add set operation to Array
39.Sort with block
40.Set includes and membership