LAB: Node Ecosystem

Before you begin

Refer to Getting Started in the lab submission instructions for complete setup, configuration, deployment, and submission instructions.

Getting Started

In the startr_code folder, there is a partial implementation of a "validator" module

In the root of that folder, you'll find a file called index.js that wires in the validator module and attempts to run functions imported from it.

In the __tests__ folder, you'll find a file called validator.test.js that wires in the validator module, sets up some testing (optimistically) but contains no test code

Requirements

Developer Implementation

USE TDD Practices

Write an object validation module that exports a "validate" method that can, based on the inputs, validate whether or not an entity is satisfactory.

Things we want to be able to validate

• Is the entity itself the right type (array, object, function etc)

• All all "required" properties present and do they have values?

  • Input needs to be an object
  • Rules needs to be an object too that defines the required properties
  • and ethe expected values

• For any property that specifies a type, does the value match that type?

• Recommended approach:

• Implement one numeric rule
• Implement one type-based rule
• Implement the required properties rule
  • https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty ;) ;)

Testing

Validation Module

• Test each method for proper/improper use (required params)
• Validate that validation is reliable
• Validate proper error conditions/returns

Software Engineering Note! Externalizing type checking and argument validation is a good exercise in refactoring code

End User Implementation

• Use the index.js file to validate objects using the imported functions from the module
• console.log() the return values

Assignemnt Submission Instructions

Refer to the the lab submission instructions for the complete lab submission process and expectations