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Ruby Hash each_pair()用法及代码示例


Hash#each_pair()是一种Hash类方法,它通过将key_value对作为参数来查找对哈希中的每一对调用一次块的嵌套值。

用法:Hash.each_pair()

参数:散列值


返回:在哈希中以key_value对为参数,对key_value对调用一次块,否则为Enumerator(如果未传递任何参数)。

示例1:

# Ruby code for Hash.each_pair() 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} 
   
# each Value 
puts "Hash a each_pair form : #{a.each_pair()}\n\n"
   
puts "Hash b each_pair form : #{b.each_pair {|key| puts "#{key}"}}\n\n"
   
puts "Hash c each_pair form : #{c.each_pair {|value| puts "#{value}"}}\n\n"

输出:

Hash a each_pair form : #

[:a, 100]
[:c, 300]
[:b, 200]
Hash b each_pair form : {:a=>100, :c=>300, :b=>200}

[:a, 100]
Hash c each_pair form : {:a=>100}

示例2:

# Ruby code for Hash.each_pair() 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} 
   
# each Value 
puts "Hash a each_pair form : #{a.each_pair()}\n\n"
   
puts "Hash b each_pair form : #{b.each_pair {|key| puts "#{key}"}}\n\n"
   
puts "Hash c each_pair form : #{c.each_pair {|value| puts "#{value}"}}\n\n"

输出:

Hash a each_pair form : #

["a", 100]
Hash b each_pair form : {"a"=>100}

["a", 100]
["c", 300]
["b", 200]
Hash c each_pair 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 each_pair() 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。