红宝石 |哈希为空？函数

Hash#empty?()是一个 Hash 类方法，它检查 Hash 数组是否有任何键值对。

Syntax: Hash.empty?()
Parameter: Hash values
Return: true – if no key value pair otherwise return false

示例 #1：

Ruby

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

输出 ：

Hash a empty? form : false

Hash b empty? form : false

Hash c empty? form : false

示例 #2：

红宝石

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

输出 ：

Hash a empty? form : false

Hash b empty? form : true

Hash c empty? form : false