Fixing 'NoMethodError' in Ruby When Calling Undefined Methods

A 'NoMethodError' in Ruby occurs when you try to call a method on an object that doesn’t respond to it.

This is a runtime error and typically arises when you make a typo in the method name or when the method is missing from the object or class you're trying to interact with.

For example, calling some_object.unknown_method will raise a NoMethodError if the method unknown_method does not exist on some_object.

One way to prevent this error is by ensuring that you are calling the correct method names, as Ruby is case-sensitive, so method_name and Method_Name would be considered two different methods.

You can also use Ruby’s respond_to? method to check if an object responds to a given method before calling it.

This method returns true if the object has the method and false otherwise.

Another technique is to use inheritance and modules to ensure that the correct methods are included in the classes or objects you're working with.

If you're working with dynamically created objects, it can be helpful to inspect the object's methods using object.methods to check for the available methods.

Proper documentation and code organization are also essential in preventing NoMethodError.

By following Ruby's conventions and ensuring that methods are defined and correctly invoked, you can reduce the occurrence of this error in your codebase.