Ruby | Set – method

The – is an inbuilt method in Ruby that returns a new set built by duplicating the set, removing every element that appears in the given enumerable object.

Syntax: s1.name – s2.name

Parameters: The function does not takes any parameter.

Return Value: It returns a new set built by duplicating the set, removing every element that appears in the given enumerable object.

Example 1:

#Ruby program to illustrate the - method

#requires the set
require "set"

    s1
    = Set[1, 2, 4] s2 = Set[1, 2, 3]

#+ method used
    s3
    = s1 - s2

#Prints the s3
               puts s3

Output:

Set: {4}

Example 2:

#Ruby program to illustrate the - method

#requires the set
require "set"

    s1
    = Set[1, 2, 4] s2 = Set[6, 5, 3]

#& method used
    s3
    = s1 - s2

#Prints the s3
               puts s3

Output:

Set: {1, 2, 4}

Reference: https://devdocs.io/ruby~2.5/set#method-i-2D