;-)

function aMinerTask(input) {

    let collection = {};

    for (let i = 0; i < input.length; i += 2) {
        let resource = input[i];
        let quantity = Number(input[i + 1]);

        if (!collection.hasOwnProperty(resource)) {
            // no need for Array, directly assign 0 to given resource
            // and later on add quantity to that resource
            collection[resource] = 0;
        }

        collection[resource] += quantity;

        // if (!collection[resource].includes(quantity)) {
        //     collection[resource].push(quantity);
        // }

        // if (collection[resource].includes(quantity)) {
        //     quantity += quantity;
        // }
    }

    for (let item in collection)
        console.log(`${item} -> ${collection[item]}`);
}