Ruby | Set < method Last Updated : 12 Jul, 2025 Summarize Comments Improve Suggest changes Share Like Article Like Report 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: CPP #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: CPP #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 Comment More infoAdvertise with us Next Article Ruby | Set << method G gopaldave Follow Improve Article Tags : Ruby Ruby-Methods Ruby Collections Ruby Set-class Similar Reads Ruby | Set <= method The <= is an inbuilt method in Ruby returns true if the set is a subset of the given set. Syntax: s1_name <= s2_name Parameters: The function takes a mandatory parameter with which it is checked for subset. Return Value: It returns self. Example 1: Ruby # Ruby program to illustrate # the <= 1 min read Ruby | Set >= method The >= is an inbuilt method in Ruby that returns true if a set if a superset of another set. If it is not a superset, then it returns false. Syntax: s1 >= s2.name Parameters: The function takes a mandatory parameter s2 which is checked for superset of s1. Return Value: It returns true if set s 1 min read Ruby | Set > method The > is an inbuilt method in Ruby that returns true if a set if a proper superset of another set. If it is not a proper superset, 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 superse 1 min read Ruby | Set << method The << is an inbuilt method in Ruby which adds an element to the set. Syntax: s1.name << (element) Parameters: The function takes an element which is to be added to the set. Return Value: It adds an element to the set. Example 1: CPP #Ruby program to illustrate the << method #requi 1 min read Ruby | Set - method The - is an inbuilt method in Ruby that returns a new set built by duplicating the set, removing every element that appears in the given enumerable object. Syntax: s1.name - s2.name Parameters: The function does not takes any parameter. Return Value: It returns a new set built by duplicating the set 1 min read Ruby | Set + method The + is an inbuilt method in Ruby that returns a set which contain all the elements of both the sets. The common elements in both the sets appears once. The '+' method acts as union operation. Syntax: s1.name + s2.name Parameters: The function does not takes any parameter. Return Value: It returns 1 min read Like