Add element to a set : Set « Collections « Ruby






  1. Ruby
  2. Collections
  3. Set

Add element to a set


require 'set'

s = Set[]              # start with an empty set
s << 1                 # => #<Set: {1}>
s.add 2                # => #<Set: {1, 2}>: add is a synonym for <<
s << 3 << 4 << 5       # => #<Set: {5, 1, 2, 3, 4}>: can be chained
s.add 3                # => #<Set: {5, 1, 2, 3, 4}>: value unchanged
s.add? 6               # => #<Set: {5, 6, 1, 2, 3, 4}>
s.add? 3               # => nil: the set was not changed








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1.Create set with Set.new
2.Create set with constant values
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.merge a range to a set
11.Remove elements from a set
12.Set subtraction
13.Delete elements from a set with block
14.Reject elements from a set
15.Do an in-place intersection like this:
16.Replace a set
17.Clear a set
18.Is it empty
19.Each loop
20.Map elements in a set
21.Collect in place
22.Convert set to array
23.Inspect a set
24.Compare two sets
25.Classify set elements as even or odd
26.Divide set
27.Divide with block
28.Flatten the subsets
29.Add new method to set
30.Partitioning or Classifying a Set
31.Divide a set by value
32.Divide a set by even and odd value
33.Divide a set by its element's class
34.Divide a set by absolute value
35.Divide set into three sub sets
36.Classify a set into three
37.Convert a hash to set and divide
38.Add set operation to Array
39.Sort with block
40.Set includes and membership