The proper_subset? 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.proper_subset?(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:
# Ruby program to illustrate the proper_subset? method # requires the set require "set"
s1 = Set[ 1 , 2 ]
s2 = Set[ 1 , 2 , 3 ]
# proper_subset method used puts s1.proper_subset?(s2) |
Output:
true
Example 2:
# Ruby program to illustrate the proper_subset? method # requires the set require "set"
s1 = Set[ 1 , 5 ]
s2 = Set[ 1 , 2 , 3 ]
# proper_subset? method used puts s1.proper_subset?(s2) |
Output:
false