JavaScript GroupBy function

groupby.js

const groupBy = function (data, key) {
    return data.reduce(function (carry, el) {
        var group = el[key];
        if (group === null) {
            group = 'General'
        }

        if (carry[group] === undefined) {
            carry[group] = []
        }

        carry[group].push(el)
        return carry
    }, {})
}

export {
    groupBy
}