categorize-by-value

Small utility written in JavaScript to ease the task of generating arrays of objects based on a value of said object.

Why

• This script is very small (<1KB) and has no dependencies.
• You could write it yourself in your script given its small size. However, dealing with arrays and object keys from scratch can turn into a headache.
• Offers fallback and transformer arguments to cover most scenarios

Useful scenarios and examples

Getting a list of planets and moons

Let's say you have just scrapped a list from space website API containing your favorite planetary systems. You want to have an array of planets and another array of moons:

const data = [{
        type: "planets",
        name: "earth",
        otherFancyData: "toAddSomeNoise",
    },
    {
        type: "moons",
        name: "europa",
        otherFancyData: "toAddSomeNoise",
    },

    {
        type: "planets",
        name: "mars",
        otherFancyData: "toAddSomeNoise"
    },
];

console.log(
    categorizeByValue({
        obj: data,
        key: "type",
        transformer: function () {
            return this.name
        }
    })
);

// { planets: [ 'earth', 'mars' ], moons: [ 'europa' ] }

Discord bots

Another scenario (which originated this module) might be having a list of registered commands in the bot cache and you want to create an structured view of them based on their category (e.g admin commands).

Contributing

Pull requests are very welcome. If you have an idea or you want to fix a bug, please do so!