The Feed API challenge - iOSLeadEssentials.com

It's time to put your skills to the test!

You are called to implement the RemoteFeedLoader to load a collection of images from a backend.

Your implementation must:

1. Conform to the <FeedLoader> protocol creating an array of FeedImage:

2. Follow the backend contract below:

Remote Feed Image Spec

Property	Type
image_id	UUID
image_desc	String (optional)
image_loc	String (optional)
image_url	URL

Payload contract

200 RESPONSE

{
	"items": [
		{
			"image_id": "a UUID",
			"image_desc": "a description",
			"image_loc": "a location",
			"image_url": "https://a-image.url",
		},
		{
			"image_id": "another UUID",
			"image_desc": "another description",
			"image_url": "https://another-image.url"
		},
		{
			"image_id": "even another UUID",
			"image_loc": "even another location",
			"image_url": "https://even-another-image.url"
		},
		{
			"image_id": "yet another UUID",
			"image_url": "https://yet-another-image.url"
		}
		...
	]
}

Instructions

The goal of this exercise is to get you used to the TDD flow.

We've provided you with appropriate tests to guide and validate your solution. You need to make all the tests pass, one by one, by implementing the load method in the existing RemoteFeedLoader class.

1. Fork the latest version of the challenge repo. Here's how forking works.

2. Open the FeedAPIChallenge.xcodeproj project on Xcode 12.2 (you can use other Xcode versions by switching to the appropriate branch, e.g., xcode11/xcode12).

3. There are two main folders in the project:

   • The FeedAPIChallenge folder contains the production types, including the RemoteFeedLoader and dependencies for requesting and loading the feed remotely.

     • ⚠️ Important: You should only change the RemoteFeedLoader.swift file to implement the load method.

   • The Tests folder contains the test cases.

     • ⚠️ Important: You should only change the LoadFeedFromRemoteUseCaseTests.swift file to implement all test cases.

4. Use the Tests/LoadFeedFromRemoteUseCaseTests.swift to validate your implementation. Uncomment and implement one test at a time following the TDD process: Make the test pass, commit, and move to the next one.

5. While developing your solutions, run all tests with CMD+U.

6. When all tests are passing and you're done implementing your solution, create a Pull Request from your branch to the main challenge repo with the title: "Your Name - Feed API Challenge.

7) Post a comment in the challenge page in the academy with the link to your PR, so we can review your solution and provide feedback.

Guidelines

1. Aim to commit your changes every time you add/alter the behavior of your system or refactor your code.

2. Aim for descriptive commit messages that clarify the intent of your contribution which will help other developers understand your train of thought and purpose of changes.

3. The system should always be in a green state, meaning that in each commit all tests should be passing.

4. The project should build without warnings.

5. The code should be carefully organized and easy to read (e.g. indentation must be consistent).

6. Make careful and proper use of access control, marking as private any implementation details that aren’t referenced from other external components.

7. Aim to write self-documenting code by providing context and detail when naming your components, avoiding explanations in comments.

Happy coding!