FreeCodeCamp

cashRegister.js

'use strict';

const denominationTypes = {
        'PENNY': 0.01,
       'NICKEL': 0.05,
         'DIME': 0.1,
      'QUARTER': 0.25,
          'ONE': 1,
         'FIVE': 5,
          'TEN': 10,
       'TWENTY': 20,
  'ONE HUNDRED': 100
};

const checkCashRegister = (price, cash, cid) => {
  const totalCash = Number(cid.map(c => c[1]).reduce((a, b) => a + b).toFixed(2));
  let due = cash - price;

  if (due > totalCash) {
    return {
      status: 'INSUFFICIENT_FUNDS',
      change: []
    }
  }
  else if (due === totalCash) {
    return {
      status: 'CLOSED',
      change: cid
    }
  }
  else if (due < totalCash) {
    const units = cid.map(c => c[0]);
    const amounts = cid.map(c => c[1]);
    let changes = [];

    for (let i = amounts.length -1; i >= 0; i--) {
      if (amounts[i] <= due) {
        changes.push([units[i], amounts[i]]);
        due = (due - amounts[i]).toFixed(2);
      }
      else if (amounts[i] >= due) {
        const value = denominationTypes[units[i]];
        const q = parseInt(due / value);
        if (q == 0) {
          continue;
        }
        const r = (due % value).toFixed(2);

        changes.push([units[i], (q * value)]);
        due = (due - (q * value)).toFixed(2);
      }
    }

    if (due == 0) {
      return {
        status: 'OPEN',
        change: changes
      }
    }
    else {
      return {
        status: 'INSUFFICIENT_FUNDS',
        change: []
      }
    }
  }
}

// Example cash-in-drawer array:
// [["PENNY", 1.01],
// ["NICKEL", 2.05],
// ["DIME", 3.1],
// ["QUARTER", 4.25],
// ["ONE", 90],
// ["FIVE", 55],
// ["TEN", 20],
// ["TWENTY", 60],
// ["ONE HUNDRED", 100]]

checkCashRegister(19.5, 20, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]]);