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

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:






#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:




#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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