Ruby Hash reject()方法

Hash#reject()是一个Hash类方法，它返回一个新的哈希，该哈希由块返回false的条目组成。

语法。Hash.reject()

参数：哈希值

返回：新的散列，由块返回false的条目组成。

枚举器 – 如果没有给定块的话

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"
  
puts "Hash b reject form : #{b.reject{|key, value| value < 200}}\n\n"

输出:

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

Hash b reject form : {}

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}