Ruby Hash shift()方法

Hash#shift()是一个Hash类方法，它从哈希中删除一个键值对，然后将这些值作为双项数组返回。

语法。Hash.shift()

参数：哈希值

返回：双项[键-值]数组

例子 #1 :

# Ruby code for Hash.shift() method
  
# declaring Hash value
a = {a:455, b:200}
  
# declaring Hash value
b = {e:500, c:300, b:200}
  
# declaring Hash value
c = {a:100}
  
  
# shift Value
puts "Hash a shift form : #{a.shift()}\n\n"
  
puts "Hash b shift form : #{b.shift()}\n\n"
  
puts "Hash c shift form : #{c.shift()}\n\n"

输出:

Hash a shift form : [:a, 455]

Hash b shift form : [:e, 500]

Hash c shift form : [:a, 100]

例子 #2 :

# Ruby code for Hash.shift() method
  
# declaring Hash value
a = { "a" => 344, "b" => 200 }
  
# declaring Hash value
b = {"a" => 100}
  
# declaring Hash value
c = {"e" => 100, "c" => 300, "b" => 200}
  
  
# shift Value
puts "Hash a shift form : #{a.shift()}\n\n"
  
puts "Hash b shift form : #{b.shift()}\n\n"
  
puts "Hash c shift form : #{c.shift()}\n\n"

输出:

Hash a shift form : ["a", 344]

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

Hash c shift form : ["e", 100]