Set

require 'set'
s = Set.new # <Set: {}>
s.instance_of?(Set)
s.size # 2

Items can have any datatype:#

[25] pry(main)> set.add([4,5,6])
=> #<Set: {1, 2, [4, 5, 6]}>
[26] pry(main)> set.add("hello")
=> #<Set: {1, 2, [4, 5, 6], "hello"}>

Add#

[16] pry(main)> set = Set.new
=> #<Set: {}>
[17] pry(main)> set.add(1)
=> #<Set: {1}>
[18] pry(main)> set.add(2)
=> #<Set: {1, 2}>
[19] pry(main)> set.add(3)
=> #<Set: {1, 2, 3}>

Delete#

[22] pry(main)> set.add(3)
=> #<Set: {1, 2, 3}>
[23] pry(main)> set.delete(3)
=> #<Set: {1, 2}>

Length#

[24] pry(main)> set.length
=> 2

Equivalent of .contains() in Java's HashSet:#

set.include?(1)

Check:#

Sorted Set

Resources:#

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