Ruby Hash compact()用法及代码示例

compact()是一种Hash类方法，在从Hash中删除所有“ nil”个值元素(如果有)后，将返回Hash。

用法：Hash.compact()

参数：散列可删除其中的“零”值。

返回：从哈希中删除所有nil值。

示例1:

# Ruby code for compact() method 
# showing how to remove nil values 
  
  
# declaring Hash value 
a = {a:100, b:nil} 
  
# declaring Hash value 
b = {a:100, c:nil, b:200} 
  
# declaring Hash value 
c = {a:100} 
  
  
# removing nil value from Hash 
puts "removing nil value : #{a.compact}\n\n"
  
# removing nil value from Hash 
puts "removing nil value : #{b.compact}\n\n"
  
# removing nil value from Hash 
puts "removing nil value : #{c.compact}\n\n"

输出：

removing nil value : {a:100}

removing nil value : {a:100, b:200}

removing nil value : {a:100}

示例2:

# Ruby code for compact() method 
# showing how to remove nil values 
  
# declaring Hash value 
a = { "a" => nil, "b" => 200 } 
  
# declaring Hash value 
b = {"a" => 100} 
  
# declaring Hash value 
c = {"a" => 100, "c" => nil, "b" => 200} 
  
# removing nil value from Hash 
puts "removing nil value : #{a.compact}\n\n"
  
# removing nil value from Hash 
puts "removing nil value : #{b.compact}\n\n"
  
# removing nil value from Hash 
puts "removing nil value : #{c.compact}\n\n"

输出：

removing nil value : {b:200}

removing nil value : {a:100}

removing nil value : {a:100, b:200}

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注：本文由纯净天空筛选整理自Kirti_Mangal大神的英文原创作品 Ruby | Hash compact() 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。