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Ruby Hash compact!()用法及代码示例


紧凑! ()是一种哈希类方法,该方法从哈希中删除所有“ nil”个值元素(如果有)后返回哈希。如果哈希中没有nil值,它将返回nil值。

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。
nil-如果哈希中没有nil值

范例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:{}

范例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:

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。