红宝石 |哈希清除（）函数

clear()是一个 Hash 类方法，它从中删除所有 Hash 元素。

Syntax: Hash.clear()

Parameter: Hashs to clear off

Return: Hash with all elements cleared

示例 #1：

# Ruby code for clear() 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}
  
puts "clear a : #{a.clear()}\n\n"
  
puts "clear b : #{b.clear()}\n\n"
  
puts "clear b : #{c.clear()}\n\n"

输出 ：

clear a : {}

clear b : {}

clear b : {}

示例 #2：

# Ruby code for clear() 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}
  
puts "clear a : #{a.clear()}\n\n"
  
puts "clear b : #{b.clear()}\n\n"
  
puts "clear b : #{c.clear()}\n\n"

输出 ：

clear a : {}

clear b : {}

clear b : {}