Ruby Hash reject! 方法

Hash#reject!() 是一个Hash类的方法，它可以检查哈希数组中是否有任何变化。

语法。Hash.reject!()

参数：哈希值

返回：true – 如果有变化，否则返回false

例子 #1 :

# Ruby code for Hash.reject!() 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}
  
  
# reject! Value
puts "Hash a reject! form : #{a.reject! {|key, value| key < "b"}}\n\n"

输出:

Hash a reject! form : {"b"=>200}

例子 #2 :

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

输出:

Hash b reject! form : {}

Hash c reject! form : {"c"=>300, "b"=>200}