红宝石 |设置差异（）函数

不同之处在于 Ruby 中的一个内置方法，它返回一个通过复制集合构建的新集合，删除出现在给定可枚举对象中的每个元素。

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.

示例 1 ：

# Ruby program to illustrate the difference method 
   
# requires the set 
require "set"
   
s1 = Set[1, 2, 4]
s2 = Set[1, 2, 3] 
   
# difference method used
s3 = s1.difference(s2)
   
# Prints the s3 
puts s3

输出：

Set: {4}

示例 2 ：

# Ruby program to illustrate the difference method 
   
# requires the set 
require "set"
   
s1 = Set[1, 2, 4]
s2 = Set[6, 5, 3] 
   
# difference method used
s3 = s1.difference(s2)
    
# Prints the s3 
puts s3

输出：

Set: {1, 2, 4}