Ruby Hash each_pair()函数

Hash#each_pair()是一个Hash类方法，它可以通过传递key_value对作为参数，为Hash中的每一对找到嵌套值，并调用一次块。

语法。Hash.each_pair()

参数：哈希值

返回：以键值对为参数，为哈希中的键值对调用一次块，否则，如果没有传递参数，则为枚举器。

例子 #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}

例子 #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}