红宝石 |字符串为空？方法

空的？是 Ruby 中的 String 类方法，用于检查字符串长度是否为零。

Syntax: str.empty?

Parameters: Here, str is the given string which is to be checked.

Returns: It returns true if str has a length of zero, otherwise false.

示例 1：

# Ruby program to demonstrate
# the empty? method
   
# Taking a string and
# using the method
puts "checking".empty?
puts "method".empty?

输出：

false
false

示例 2：

# Ruby program to demonstrate
# the empty? method
   
# Taking a string and
# using the method
puts "".empty?
puts ".".empty?

输出：

true
false