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Ruby | Set << method

Last Updated : 12 Jul, 2025
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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

#requires the set
require "set"

    s1
    = Set[2, 1]

#Prints s1
      puts s1

#Enters 4 into it
          s1
      << 4

#Prints s1
      puts s1

#Enters 4 into it
#But set has already 4
          s1
      << 4

#Prints s1
      puts s1
Output:
Set: {2, 1}
Set: {2, 1, 4}
Set: {2, 1, 4}
Example 2: CPP
#Ruby program to illustrate the << method

#requires the set
require "set"

    s1
    = Set[]

#Prints s1
      puts s1

#Enters 1 into it
          s1
      << 1

#Enters 2 into it
      s1
      << 2

#Prints s1
      puts s1
Output:
Set: {}
Set: {1, 2}
Reference: https://devdocs.io/ruby~2.5/set#method-i-3C-3C

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