Ruby Hash select()方法

Hash#select() : select()是一个Hash类方法，它可以根据块条件从哈希中找到数组。

语法。Hash.select()

参数：哈希值

区块条件

返回：根据区块条件从哈希中找到数组。

例子 #1 :

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

输出:

Hash a select form : {"a"=>100}

例子 #2 :

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

输出:

Hash b select form : {"a"=>100}

Hash c select form : {"a"=>100}