POJO Data Manipulation Practice

In this practice, you will write functions that access and manipulate data from a real data set on fruit types. The data set is in the fruit-data.js file.

The data set is structured as an array, including 31 objects. Each object represents the data for a single fruit. The example below shows the data structure for each object:

// fruit-data.js file

const fruits = [        // large array of 31 different fruits
    {                       // each fruit represented by an object
        "genus": "Malus",
        "name": "Apple",
        "id": 6,
        "family": "Rosaceae",
        "order": "Rosales",
        "nutritions": {         // nested object contains nutrition information
            "carbohydrates": 11.4,
            "protein": 0.3,
            "fat": 0.4,
            "calories": 52,
            "sugar": 10.3
        }
    },
    // ...followed by 30 more fruit objects with the same structure
];

You will need to use many of the POJO methods that you have already learned to complete each task.

Phase 0: Setup

To get started, use the following commands:

1. Clone the starter repository
2. cd into the project directory
3. npm install to install dependencies

The mocha command will run all the tests. If you have any trouble with this don't hesitate to ask a TA for help! You should have mocha installed and will need to pass all the tests in order to move on.

To test only one of the test files at a time, you can run the command, mocha test/<test file name> (e.g. mocha test/01-fruit-data-structure-spec.js), where test is the name of the test folder. You must run this command one directory above the test directory.

You may notice the package.json/package-lock.json files and node_modules directory. You do not need to edit any of those contents. Those files are what we use to package the project and create the test cases.

Phase 1: Understanding the Data Structure

Start in the problems/01-fruit-data-structure.js file. Write out six functions according to the directions. The return values of these functions will help you understand the structure of the data within the fruits array.

Complete each function in order, because you may be able to use some of your functions as helper functions in later problems.

Run mocha test/01-fruit-data-structure-spec.js to run all the test specs for this phase. When all of the tests pass, you can move on to Phase 2.

Phase 2: Manipulating Data within Objects

In this phase, you will practice manipulating the data within the data objects; adding keys and values, updating key names and values, and deleting key-value pairs.

Run mocha test/02-manipulate-fruit-objects-spec.js to run all the test specs for this phase. There are multiple test specs for each problem. Run the tests often, as the error messages for the failed tests will help you to debug your code.