更新：

可以使用.class获取Object的类，也可以使用.class.is_a?(Class)获取布尔响应：

ary = []
ary.class => Array
hsh = {}
hsh.class => Hash
float = 10.456
float.class => Float

# and get boolean responses like this:
hsh.class.is_a?(Hash) => true
hsh.class.is_a?(Array) => false

因此，您可以独立处理每个Class。如果有很多潜在的类，请使用case语句：

case value.class
when Array
  # do something to the array
when Hash
  # do something to the hash
when Float
  # do something to the float
when Integer
  # do something to the integer
...
end

旧版：

您可以使用.include?()

array = ['a', 'b', 'c']
array.include?('c') => true
array.include?('d') => false

举个例子：

if array.include?(value)
  # do something
else
  # do something else
end

if value.is_a?(Array)
  # do something
else
  # do something else
end

或

if value.kind_of?(Array)
  # do something
else
  # do something else
end

#kind_of?和#is_a?具有相同的行为。
Ruby: kind_of? vs. instance_of? vs. is_a?