在看Selenium源代碼的時候, 發現了獲取操作系統的更好方法

def os
@os ||= (
host_os = RbConfig::CONFIG['host_os']
case host_os
when /mswin|msys|mingw|cygwin|bccwin|wince|emc/
:windows
when /darwin|mac os/
:macosx
when /linux/
:linux
when /solaris|bsd/
:unix
else
raise Error::WebDriverError, "unknown os: #{host_os.inspect}"
end
)
end

之前用的方法是假定是windows, 如果不是的話根據異常處理來判斷是否是Mac

有一個叫methods()的方法，比如Array.methods()

--------------------------------------------------------- Object#methods
obj.methods => array
------------------------------------------------------------------------
Returns a list of the names of methods publicly accessible in
_obj_. This will include all the methods accessible in _obj_'s
ancestors.

class Klass
def kMethod()
end
end
k = Klass.new
k.methods[0..9] #=> ["kMethod", "freeze", "nil?", "is_a?",
"class", "instance_variable_set",
"methods", "extend", "<em>send</em>", "instance
_eval"]
k.methods.length #=> 42

代碼如下：
[ruby] view plaincopy
class Object
def abc
p "instance abc"
end
def self.abc
p "class abc"
end
end