name error on ruby

When encountering a NameError in Ruby, it means that the program is trying to reference a variable or method that hasn't been defined or is out of scope. Here's an explanation of each step to understand why the NameError occurs:

1. Check the error message: The error message will provide information about the specific line where the NameError occurred. It will also indicate the name of the undefined variable or method.

2. Identify the context: Look at the code surrounding the line mentioned in the error message. This will help you understand the scope and context in which the variable or method is being used.

3. Verify variable or method existence: Make sure that the variable or method being referenced in the code actually exists. Check for typos, incorrect casing, or missing declarations.

4. Check variable scope: If the variable or method is defined in another scope, such as within a different class or method, ensure that it is accessible from the current scope. If not, consider adjusting the scope or passing the variable as an argument.

5. Consider load order: If the variable or method is defined in a separate file or module, ensure that it is loaded before the code referencing it. Check for any missing require statements or incorrect file load order.

6. Debugging techniques: Use debugging techniques like printing variable values or using breakpoints to understand the flow of the program and identify any issues with variable assignment or method invocation.

By following these steps, you should be able to identify the cause of the NameError and resolve it by ensuring the proper definition and scope of variables and methods in your Ruby code.