equally spreads number into array with n integer elements, equally filling unevens

spread.js

export default (number, parts) => {
    if (!parts) {
        return [];
    }

    let left = number;

    const result = [];

    const fullMin = Math.floor(number / parts);
    for (let i = 0; i < parts; i++) {
        result.push(fullMin);
        left -= fullMin;
    }

    let rest = left % parts;
    const every = Math.floor(parts / rest);

    let i = 0;
    while (rest > 0) {
        result[i] += 1;
        rest -= 1;
        i += every;
    }

    return result;
};