CAPPY

function solveCurrentProblem(input) {

    let map = new Map();
    let remaining = new Map();

    for (let productInfo of input) {

        let [product, quantity] = productInfo.split(/\s+=>\s+/);

        if (quantity >= 1000 || (quantity + remaining.get(product) >= 1000) || (quantity + map.get(product) >= 1000)) {

            let left = remaining.get(product) !== undefined ? Number(remaining.get(product)) : 0;

            if(map.has(product) === false){
                map.set(product, 0);

            }
            map.set(product, map.get(product) + +quantity + left);
            remaining.delete(product);

        } else {
            if(remaining.has(product) === false){
                remaining.set(product, 0);
            }

            remaining.set(product, Number(remaining.get(product)) + +quantity);
        }
    }

    Array.from(map.keys()).forEach(fruit => {
        let bottles = Math.floor(map.get(fruit) / 1000);
        console.log(`${fruit} => ${bottles}`);
    })
}