红宝石 |字符串 ascii_only？方法

ascii_only？是 Ruby 中的 String 类方法，用于检查只有 ASCII字符的字符串。

Syntax: str.ascii_only?

Parameters: Here str is the string to be checked.

Returns: True for a string which has only ASCII characters otherwise return false.

示例 1：

#ruby 2.3.1 
     
# Ruby program to demonstrate
# the ascii_only? method
     
# Taking a string and
# using the method
puts "95ruby2364127".ascii_only?
  
puts "\u{1234}".ascii_only?

输出：

true
false

示例 2：

#ruby 2.3.1 
     
# Ruby program to demonstrate
# the ascii_only? method
     
# Taking a string and
# using the method
puts "STRING".ascii_only?
  
puts "\u{7894}".force_encoding("UTF-8").ascii_only?

输出：

true
false