scratch_94.es6

const comb = require('/Users/mattcarter/git/c2fo/node_modules/comb');
const dateFormat = (dt) => comb.date.format(dt, 'yyyy-MM-dd');

/**
 * Issues:
 *   1. Cannot use Date instances as Map keys, they'll never hit unless you
 *      use the same instance.
 *   2. Setting an empty object in the due date for a cache and having another
 *      invoice come in with that due date after will result in that second invoice
 *      not getting it's dueDate updated as we return an empty {}
 */

const callCounts = {
    set: 0,
    get: 0,
    has: 0,
};

class MMap extends Map {
    setData(k, v) {
        // console.log(`setData to map [k=${k}, v=${JSON.stringify(v)}]`);
        callCounts.set++;
        return this.set(k, v);
    }

    getData(k) {
        // console.log(`getData from map [k=${k}]`);
        callCounts.get++;
        return this.get(k);
    }

    hasData(k) {
        // console.log(`hasData from map k=${k}]`);
        callCounts.has++;
        return this.has(k);
    }
}

class PaymentSettings {
    constructor() {
        this.cache = new MMap();
        this.fakerCallCount = 0;
    }

    _rRuleFaker(dueDate) {
        this.fakerCallCount++;
        if (this.fakerCallCount === 1) {
            return dueDate;
        } else if (this.fakerCallCount === 2) {
            return comb.date.add(dueDate, 'weekdays', 1);
        } else if (this.fakerCallCount === 3) {
            return comb.date.add(dueDate, 'weekdays', 2);
        } else {
            return comb.date.add(dueDate, 'weekdays', 1);
        }
    }


    process(invoice = {}) {
        const {dueDate} = invoice;
        const formattedDueDate = dateFormat(dueDate);
        console.log(`process invoice [id=${invoice.id}, dueDate=${dueDate}]`);

        if (this.cache.hasData(formattedDueDate)) {
            console.log(`   invoice dueDate in cache! [dueDate=${formattedDueDate}, cache=${JSON.stringify(this.cache.getData(formattedDueDate))}]`);
            return {
                dueDate: this.cache.getData(formattedDueDate),
                updated: new Date(),
            };
        }

        const nextValidDueDate = this._rRuleFaker(dueDate);
        if (comb.date.compare(nextValidDueDate, dueDate, 'days')) {
            console.log('   caching next valid due date');
            this.cache.setData(formattedDueDate, {
                dueDate: nextValidDueDate,
            });
        } else {
            console.log('   else, setting empty data');
            this.cache.setData(formattedDueDate, {});
        }

        console.log(`   done -> [id=${invoice.id}, fromCache=${JSON.stringify(this.cache.getData(formattedDueDate))}]`);
        return this.cache.getData(formattedDueDate);
    }

    done() {
        console.log('\ndone', JSON.stringify(callCounts));
    }
}

const invoices = [
    {
        id: 1,
        dueDate: new Date(2020, 2, 19)
    },
    {
        id: 2,
        dueDate: new Date(2020, 2, 19),
    },
    {
        id: 3,
        dueDate: new Date(2020, 2, 21),
    },
    {
        id: 4,
        dueDate: new Date(2020, 2, 21),
    },
    {
        id: 5,
        dueDate: new Date(2020, 2, 22),
    }
];

const p = new PaymentSettings();
const updates = invoices.map(invoice => Object.assign({id: invoice.id}, p.process(invoice)));
p.done();
console.log('\n', JSON.stringify(updates));

scratch_94.output

process invoice [id=1, dueDate=Thu Mar 19 2020 00:00:00 GMT+0000 (UTC)]
   else, setting empty data
   done -> [id=1, fromCache={}]
process invoice [id=2, dueDate=Thu Mar 19 2020 00:00:00 GMT+0000 (UTC)]
   invoice dueDate in cache! [dueDate=2020-03-19, cache={}]
process invoice [id=3, dueDate=Sat Mar 21 2020 00:00:00 GMT+0000 (UTC)]
   caching next valid due date
   done -> [id=3, fromCache={"dueDate":"2020-03-23T00:00:00.000Z"}]
process invoice [id=4, dueDate=Sat Mar 21 2020 00:00:00 GMT+0000 (UTC)]
   invoice dueDate in cache! [dueDate=2020-03-21, cache={"dueDate":"2020-03-23T00:00:00.000Z"}]
process invoice [id=5, dueDate=Sun Mar 22 2020 00:00:00 GMT+0000 (UTC)]
   caching next valid due date
   done -> [id=5, fromCache={"dueDate":"2020-03-24T00:00:00.000Z"}]

done {"set":3,"get":10,"has":5}

 [{"id":1},{"id":2,"dueDate":{},"updated":"2020-03-19T17:59:20.374Z"},{"id":3,"dueDate":"2020-03-23T00:00:00.000Z"},{"id":4,"dueDate":{"dueDate":"2020-03-23T00:00:00.000Z"},"updated":"2020-03-19T17:59:20.376Z"},{"id":5,"dueDate":"2020-03-24T00:00:00.000Z"}]

scratch_95.es6

const comb = require('/Users/mattcarter/git/c2fo/node_modules/comb');
const dateFormat = (dt) => comb.date.format(dt, 'yyyy-MM-dd');

/**
 * Issues:
 *   1. Cannot use Date instances as Map keys, they'll never hit unless you
 *      use the same instance.
 *   2. Setting an empty object in the due date for a cache and having another
 *      invoice come in with that due date after will result in that second invoice
 *      not getting it's dueDate updated as we return an empty {}
 */

const callCounts = {
    set: 0,
    get: 0,
    has: 0,
};

class MMap extends Map {
    setData(k, v) {
        // console.log(`setData to map [k=${k}, v=${JSON.stringify(v)}]`);
        callCounts.set++;
        return this.set(k, v);
    }

    getData(k) {
        // console.log(`getData from map [k=${k}]`);
        callCounts.get++;
        return this.get(k);
    }

    hasData(k) {
        // console.log(`hasData from map k=${k}]`);
        callCounts.has++;
        return this.has(k);
    }
}

class PaymentSettings {
    constructor() {
        this.cache = new MMap();
        this.fakerCallCount = 0;
    }

    _rRuleFaker(dueDate) {
        this.fakerCallCount++;
        if (this.fakerCallCount === 1) {
            return dueDate;
        } else if (this.fakerCallCount === 2) {
            return comb.date.add(dueDate, 'weekdays', 1);
        } else if (this.fakerCallCount === 3) {
            return comb.date.add(dueDate, 'weekdays', 2);
        } else {
            return comb.date.add(dueDate, 'weekdays', 1);
        }
    }


    process(invoice = {}) {
        const {dueDate} = invoice;
        const formattedDueDate = dateFormat(dueDate);
        console.log(`process invoice [id=${invoice.id}, dueDate=${dueDate}]`);

        if (this.cache.hasData(formattedDueDate)) {
            console.log(`   invoice dueDate in cache! [dueDate=${formattedDueDate}, cache=${JSON.stringify(this.cache.getData(formattedDueDate))}]`);
            return {
                dueDate: this.cache.getData(formattedDueDate),
                updated: new Date(),
            };
        }

        const nextValidDueDate = this._rRuleFaker(dueDate);
        this.cache.setData(formattedDueDate, nextValidDueDate);
        if (comb.date.compare(nextValidDueDate, dueDate, 'days')) {
            console.log('   caching next valid due date');
            return {
                dueDate: nextValidDueDate,
            }
        }

        console.log(`   done -> [id=${invoice.id}, fromCache=${JSON.stringify(this.cache.getData(formattedDueDate))}]`);
        return {};
    }

    done() {
        console.log('\ndone', JSON.stringify(callCounts));
    }
}

const invoices = [
    {
        id: 1,
        dueDate: new Date(2020, 2, 19)
    },
    {
        id: 2,
        dueDate: new Date(2020, 2, 19),
    },
    {
        id: 3,
        dueDate: new Date(2020, 2, 21),
    },
    {
        id: 4,
        dueDate: new Date(2020, 2, 21),
    },
    {
        id: 5,
        dueDate: new Date(2020, 2, 22),
    }
];

const p = new PaymentSettings();
const updates = invoices.map(invoice => Object.assign({id: invoice.id}, p.process(invoice)));
p.done();
console.log('\n', JSON.stringify(updates));

scratch_95.output

/Users/mattcarter/.nvm/versions/node/v8.16.0/bin/node /Users/mattcarter/Library/Preferences/WebStorm2019.3/scratches/scratch_95.es6
process invoice [id=1, dueDate=Thu Mar 19 2020 00:00:00 GMT+0000 (UTC)]
   done -> [id=1, fromCache="2020-03-19T00:00:00.000Z"]
process invoice [id=2, dueDate=Thu Mar 19 2020 00:00:00 GMT+0000 (UTC)]
   invoice dueDate in cache! [dueDate=2020-03-19, cache="2020-03-19T00:00:00.000Z"]
process invoice [id=3, dueDate=Sat Mar 21 2020 00:00:00 GMT+0000 (UTC)]
   caching next valid due date
process invoice [id=4, dueDate=Sat Mar 21 2020 00:00:00 GMT+0000 (UTC)]
   invoice dueDate in cache! [dueDate=2020-03-21, cache="2020-03-23T00:00:00.000Z"]
process invoice [id=5, dueDate=Sun Mar 22 2020 00:00:00 GMT+0000 (UTC)]
   caching next valid due date

done {"set":3,"get":5,"has":5}

 [{"id":1},{"id":2,"dueDate":"2020-03-19T00:00:00.000Z","updated":"2020-03-19T18:12:29.918Z"},{"id":3,"dueDate":"2020-03-23T00:00:00.000Z"},{"id":4,"dueDate":"2020-03-23T00:00:00.000Z","updated":"2020-03-19T18:12:29.918Z"},{"id":5,"dueDate":"2020-03-24T00:00:00.000Z"}]

Process finished with exit code 0