红宝石 |哈希选择！（）方法

Hash#select!()是一个 Hash 类方法，它根据块条件检查哈希中的数组是否存在。

Syntax: Hash.select!()

Parameter: Hash values
block condition

Return: array from the hash is present based on the block condition otherwise return false

示例 #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}

示例 #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 : 

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