红宝石 |数组差分 (-)函数

Array#-()是一个 Array 类方法，它通过删除两个数组的相似元素来执行集差操作。

Syntax: Array.-()

Parameter: Arrays for performing the concatenation operation.

Return: New arrays by removing the same elements of the two arrays.

示例 #1：

# Ruby code for -() method
# showing concatenate operation
  
# declaring array
a = [18, 22, 33, 4, 5, 6]
  
# declaring array
b = [5, 4, 22, 1, 88, 9]
  
# declaring array
c = [18, 22, 33, 40, 50, 6]
  
# differencing arrays
puts "difference of a and b : #{a - b}\n\n"
  
# differencing arrays
puts "difference of a and c : #{a - c}\n\n"
  
# differencing arrays
puts "difference of b and c : #{b - c}\n\n"

输出 ：

difference of a and b : [18, 33, 6]

difference of a and c : [4, 5]

difference of b and c : [5, 4, 1, 88, 9]

示例 #2：

# Ruby code for -() method
# showing concatenate operation
  
# declaring array
a = ["abc", "xyz", "dog"]
  
# declaring array
b = ["cow", "cat", "dog"]
  
# declaring array
c = ["cat", "1", "dog"]
  
# differencing arrays
puts "difference of a and b : #{a - b}\n\n"
  
# differencing arrays
puts "difference of a and c : #{a - c}\n\n"
  
# differencing arrays
puts "difference of b and c : #{b - c}\n\n"

输出 ：

difference of a and b : ["abc", "xyz"]

difference of a and c : ["abc", "xyz"]

difference of b and c : ["cow"]