Ruby Hash to_a方法

Hash#to_a() 是一个Hash类方法，它给出了一个键值对的嵌套数组。

语法。Hash.to_a()

参数：哈希值

返回：哈希值的数组表示

例子 #1 :

# Ruby code for Hash.to_a() 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}
  
  
# to_a Value
puts "Hash a to_a form : #{a.to_a()}\n\n"
  
puts "Hash b to_a form : #{b.to_a()}\n\n"
  
puts "Hash c to_a form : #{c.to_a()}\n\n"

输出:

Hash a to_a form : [[:a, 100], [:b, 200]]

Hash b to_a form : [[:a, 100], [:c, 300], [:b, 200]]

Hash c to_a form : [[:a, 100]]

例子 #2 :

# Ruby code for Hash.to_a() 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}
  
  
# to_a Value
puts "Hash a to_a form : #{a.to_a()}\n\n"
  
puts "Hash b to_a form : #{b.to_a()}\n\n"
  
puts "Hash c to_a form : #{c.to_a()}\n\n"

输出:

Hash a to_a form : [["a", 100], ["b", 200]]

Hash b to_a form : [["a", 100]]

Hash c to_a form : [["a", 100], ["c", 300], ["b", 200]]