Ruby Array product()用法及代码示例

Array＃product()：product()是一个Array类方法，该方法返回所有数组中元素的所有组合的数组。

用法：Array.product()

参数：数组

返回：所有数组中元素的所有组合的数组。

示例1:

# Ruby code for product() method 
  
# declaring array 
a = [18, 22, 33, nil, 5, 6] 
  
# declaring array 
b = [1, 4, 1, 1, 88, 9] 
  
# declaring array 
c = [2, 5] 
  
# product method example 
puts "product() method form : #{a.product(c)}\n\n"
  
puts "product() method form : #{b.product(c)}\n\n"
  
puts "product() method form : #{c.product(a)}\n\n"

输出：

product() method form : [[18, 2], [18, 5], [22, 2], [22, 5], [33, 2], [33, 5], [nil, 2], [nil, 5], [5, 2], [5, 5], [6, 2], [6, 5]]

product() method form : [[1, 2], [1, 5], [4, 2], [4, 5], [1, 2], [1, 5], [1, 2], [1, 5], [88, 2], [88, 5], [9, 2], [9, 5]]

product() method form : [[2, 18], [2, 22], [2, 33], [2, nil], [2, 5], [2, 6], [5, 18], [5, 22], [5, 33], [5, nil], [5, 5], [5, 6]]

示例2:

# Ruby code for product() method 
  
# declaring array 
a = ["abc", "nil", "dog"] 
  
# declaring array 
c = [nil] 
  
# declaring array 
b = ["cow", nil, "dog"] 
  
# product method example 
puts "product() method form : #{a.product(c)}\n\n"
  
puts "product() method form : #{b.product(c)}\n\n"
  
puts "product() method form : #{c.product(a)}\n\n"

输出：

product() method form : [["abc", nil], ["nil", nil], ["dog", nil]]

product() method form : [["cow", nil], [nil, nil], ["dog", nil]]

product() method form : [[nil, "abc"], [nil, "nil"], [nil, "dog"]]

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注：本文由纯净天空筛选整理自mayank5326大神的英文原创作品 Ruby | Array product() function。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。