Ruby Hash keep_if()用法及代码示例

Hash＃keep_if()是一种Hash类方法，仅保留遵循块条件的那些键值对。

用法：Hash.keep_if()

参数：散列值
阻止–条件

返回：符合条件的键值对

示例1:

# Ruby code for Hash.keep_if() method 
  
# declaring Hash value 
a = {a:100, b:200} 
  
# declaring Hash value 
b = {a:100, c:300, b:200} 
  
# declaring Hash value 
c = {a:100} 
  
  
# keep_if Value 
puts "Hash a keep_if form : #{a.keep_if{|key| key != 100}}\n\n"
  
puts "Hash b keep_if form : #{b.keep_if{|key| key = 200}}\n\n"
  
puts "Hash c keep_if form : #{c.keep_if{|key| key != 200}}\n\n"

输出：

Hash a keep_if form : {:a=>100, :b=>200}

Hash b keep_if form : {:a=>100, :c=>300, :b=>200}

Hash c keep_if form : {:a=>100}

示例2:

# Ruby code for Hash.keep_if() method 
  
# declaring Hash value 
a = { "a" => 100, "b" => 200 } 
  
# declaring Hash value 
b = {"a" => 100} 
  
# declaring Hash value 
c = {"a" => 100, "c" => 300, "b" => 200} 
  
# keep_if Value 
puts "Hash a keep_if form : #{a.keep_if{|key| key != 100}}\n\n"
  
puts "Hash b keep_if form : #{b.keep_if{|key| key = 200}}\n\n"
  
puts "Hash c keep_if form : #{c.keep_if{|value| value != 200}}\n\n"

输出：

Hash a keep_if form : {"a"=>100, "b"=>200}

Hash b keep_if form : {"a"=>100}

Hash c keep_if form : {"a"=>100, "c"=>300, "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 keep_if() 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。