Dynamically Calling Ruby Methods by Name: A How-To Guide
If you're working with Ruby, you may come across a situation where you need to dynamically call a method by its name. Fortunately, Ruby makes this relatively easy to accomplish.
To dynamically call a Ruby method by name, you can use the
send method. This method takes the name of the method you want to call as a symbol, and any arguments you want to pass to the method. For example, if you have a method called
my_method and you want to call it dynamically, you can use the following code:
method_name = :my_method object.send(method_name, arg1, arg2, ...)
In this code,
object is the object that the method is being called on. If you're calling the method on the current object (i.e. "self"), you can omit the object parameter and simply call
send on the method name:
method_name = :my_method send(method_name, arg1, arg2, ...)
You can also use
public_send instead of
send if you only want to call public methods on the object.
If the method you want to call is defined on a module instead of a class or object, you can use the
Module#method method to get a reference to the method, and then call it using
send. For example:
module MyModule def my_method(arg) puts arg end end method_name = :my_method method = MyModule.method(method_name) method.call(arg)
In this code, we define a module called
MyModule and a method called
my_method. We then get a reference to the method using
Module#method, and call it using
Overall, dynamically calling Ruby methods by name is a useful technique to have in your programming arsenal. With the
send method and some knowledge of the object-oriented features of Ruby, you can easily call any method you need at runtime.