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Ruby | Set < method
  • Last Updated : 07 Jan, 2020

The < is an inbuilt method in Ruby that returns true if a set if a proper subset of another set. If it is not a proper subset, then it returns false.

Syntax: s1.name < s2.name

Parameters: The function does not takes any parameter.

Return Value: It returns true if set s1 is a proper subset of s2, else it returns false.

Example 1:






#Ruby program to illustrate the < method
  
#requires the set
require "set"
  
    s1
    = Set[1, 2] s2 = Set[1, 2, 3]
  
# <method used
                     puts s1
                     < s2

Output:

true

Example 2:




#Ruby program to illustrate the < method
  
#requires the set
require "set"
  
    s1
    = Set[1, 5] s2 = Set[1, 2, 3]
  
# <method used
                     puts s1
                     < s2

Output:

false

Reference: https://devdocs.io/ruby~2.5/set#method-i-3C

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