Ruby | Set add() method

The add is an inbuilt method in Ruby which adds an element to the set. It returns itself after addition.

Syntax: s1.name.add(object)

Parameters: The function takes the object to be added to the set.

Return Value: It adds the object to the set and returns self.

Example 1:

#Ruby program to illustrate the add method

#requires the set
require "set"

    s1
    = Set[2, 1]

#Prints s1
      puts s1

#Enters 4 into it
          s1.add(4)

#Prints s1
              puts s1

#Enters 4 into it
#But set has already 4
                  s1.add(4)

#Prints s1
                      puts s1

Output:

Set: {2, 1}
Set: {2, 1, 4}
Set: {2, 1, 4}

Example 2:

#Ruby program to illustrate the add() method

#requires the set
require "set"

    s1
    = Set[]

#Prints s1
      puts s1

#Enters 1 into it
          s1.add(1)

#Enters 2 into it
              s1.add(2)

#Prints s1
                  puts s1

Output:

Set: {}
Set: {1, 2}

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