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:

#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