Check whether a variable is a string in Ruby

Question

Is there anything more idiomatic than the following   foo class    String

User · Answer

A more duck-typing approach would be to say

foo.respond_to?(:to_str)

to_str indicates that an object's class may not be an actual descendant of the String, but the object itself is very much string-like (stringy?).

User · Answer

You can do   foo instance of  String    And the more general   foo kind of  String

User · Answer

foo instance of  String   or   foo kind of  String    if you you only care if it is derrived from String somewhere up its inheritance chain

User · Answer

I think you are looking for instance of   is a  and kind of  will return true for instances from derived classes    class X  lt  String end  foo   X new  foo is a  String           true foo kind of  String        true foo instance of  String    false foo instance of  X         true

User · Answer

In addition to the other answers  Class defines the method     to test whether an object is an instance of that class    o class class of o  o instance of  c determines whether o class    c o is a  c Is o an instance of c or any of it s subclasses  o kind of  c synonym for  is a   c     o for a class or module  determine if  o is a  c   String      s  returns true

User · Answer

I think a better way is to create some predicate methods  This will also save your  Single Point of Control    class Object  def is string     false  end end  class String  def is string     true  end end  print  test  is string     gt  true print 1 is string          gt  false   The more duck typing way

[ruby] Check whether a variable is a string in Ruby

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