/ Ruby
/
method

instance_variable_set

ruby latest stable - Class: Object
instance_variable_set(p1, p2)
public

Sets the instance variable named by symbol to the given object, thereby frustrating the efforts of the class’s author to attempt to provide proper encapsulation. The variable does not have to exist prior to this call. If the instance variable name is passed as a string, that string is converted to a symbol.

class Fred
  def initialize(p1, p2)
    @a, @b = p1, p2
  end
end
fred = Fred.new('cat', 99)
fred.instance_variable_set(:@a, 'dog')   #=> "dog"
fred.instance_variable_set(:@c, 'cat')   #=> "cat"
fred.inspect                             #=> "#<Fred:0x401b3da8 @a=\"dog\", @b=99, @c=\"cat\">"

1Note

Example

kyptin · Nov 18, 20095 thanks

=== code: class Klass def set(string) var_name = "@#{string}" # the '@' is required self.instance_variable_set(var_name, 'bar') end def puts_foo puts @foo end end k = Klass.new k.puts_foo # nil k.set('foo') k.puts_foo # 'bar'