--- id: aa2e6f85cab2ab736c9a9b24 title: Caja registradora challengeType: 5 forumTopicId: 16012 dashedName: cash-register --- # --description-- Diseña una función `checkCashRegister()` que acepte el precio de compra como primer argumento (`price`), la cantidad pagada como segundo argumento (`cash`), y el dinero en efectivo que tiene la caja (`cid`) como tercer argumento. `cid` es un arreglo 2D que enumera las monedas disponibles. La función `checkCashRegister()` siempre debe devolver un objeto con una clave `status` y una clave `change`. Devuelve `{status: "INSUFFICIENT_FUNDS", change: []}` si el efectivo en caja es menor que el cambio necesario, o si no puedes devolver el cambio exacto. Devuelve `{status: "CLOSED", change: [...]}` si el efectivo en caja como valor de la clave `change` es igual al cambio que se debe entregar. En cualquier otro caso, devuelve `{status: "OPEN", change: [...]}`, con el cambio a entregar en monedas y billetes, ordenados de mayor a menor, como valor de la clave `change`.
Unidad MonetariaImporte
Penny$0.01 (PENNY)
Nickel$0.05 (NICKEL)
Dime$0.1 (DIME)
Quarter$0.25 (QUARTER)
Dollar$1 (ONE)
Five Dollars$5 (FIVE)
Ten Dollars$10 (TEN)
Twenty Dollars$20 (TWENTY)
One-hundred Dollars$100 (ONE HUNDRED)
A continuación, un ejemplo del efectivo en caja en formato de arreglo: ```js [ ["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100] ] ``` # --hints-- `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]])` debe devolver un objeto. ```js assert.deepEqual( Object.prototype.toString.call( 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] ]) ), '[object Object]' ); ``` `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]])` debe devolver `{status: "OPEN", change: [["QUARTER", 0.5]]}`. ```js assert.deepEqual( 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] ]), { status: 'OPEN', change: [['QUARTER', 0.5]] } ); ``` `checkCashRegister(3.26, 100, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]])` debe devolver `{status: "OPEN", change: [["TWENTY", 60], ["TEN", 20], ["FIVE", 15], ["ONE", 1], ["QUARTER", 0.5], ["DIME", 0.2], ["PENNY", 0.04]]}`. ```js assert.deepEqual( checkCashRegister(3.26, 100, [ ['PENNY', 1.01], ['NICKEL', 2.05], ['DIME', 3.1], ['QUARTER', 4.25], ['ONE', 90], ['FIVE', 55], ['TEN', 20], ['TWENTY', 60], ['ONE HUNDRED', 100] ]), { status: 'OPEN', change: [ ['TWENTY', 60], ['TEN', 20], ['FIVE', 15], ['ONE', 1], ['QUARTER', 0.5], ['DIME', 0.2], ['PENNY', 0.04] ] } ); ``` `checkCashRegister(19.5, 20, [["PENNY", 0.01], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]])` debe devolver `{status: "INSUFFICIENT_FUNDS", change: []}`. ```js assert.deepEqual( checkCashRegister(19.5, 20, [ ['PENNY', 0.01], ['NICKEL', 0], ['DIME', 0], ['QUARTER', 0], ['ONE', 0], ['FIVE', 0], ['TEN', 0], ['TWENTY', 0], ['ONE HUNDRED', 0] ]), { status: 'INSUFFICIENT_FUNDS', change: [] } ); ``` `checkCashRegister(19.5, 20, [["PENNY", 0.01], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 1], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]])` debe devolver `{status: "INSUFFICIENT_FUNDS", change: []}`. ```js assert.deepEqual( checkCashRegister(19.5, 20, [ ['PENNY', 0.01], ['NICKEL', 0], ['DIME', 0], ['QUARTER', 0], ['ONE', 1], ['FIVE', 0], ['TEN', 0], ['TWENTY', 0], ['ONE HUNDRED', 0] ]), { status: 'INSUFFICIENT_FUNDS', change: [] } ); ``` `checkCashRegister(19.5, 20, [["PENNY", 0.5], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]])` debe devolver `{status: "CLOSED", change: [["PENNY", 0.5], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]]}`. ```js assert.deepEqual( checkCashRegister(19.5, 20, [ ['PENNY', 0.5], ['NICKEL', 0], ['DIME', 0], ['QUARTER', 0], ['ONE', 0], ['FIVE', 0], ['TEN', 0], ['TWENTY', 0], ['ONE HUNDRED', 0] ]), { status: 'CLOSED', change: [ ['PENNY', 0.5], ['NICKEL', 0], ['DIME', 0], ['QUARTER', 0], ['ONE', 0], ['FIVE', 0], ['TEN', 0], ['TWENTY', 0], ['ONE HUNDRED', 0] ] } ); ``` # --seed-- ## --seed-contents-- ```js function checkCashRegister(price, cash, cid) { let change; return change; } 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]]); ``` # --solutions-- ```js const denom = [ { name: "ONE HUNDRED", val: 100 }, { name: "TWENTY", val: 20 }, { name: "TEN", val: 10 }, { name: "FIVE", val: 5 }, { name: "ONE", val: 1 }, { name: "QUARTER", val: 0.25 }, { name: "DIME", val: 0.1 }, { name: "NICKEL", val: 0.05 }, { name: "PENNY", val: 0.01 }, ]; function checkCashRegister(price, cash, cid) { const output = { status: null, change: [] }; let change = cash - price; const register = cid.reduce( function (acc, curr) { acc.total += curr[1]; acc[curr[0]] = curr[1]; return acc; }, { total: 0 } ); if (register.total === change) { output.status = "CLOSED"; output.change = cid; return output; } if (register.total < change) { output.status = "INSUFFICIENT_FUNDS"; return output; } const change_arr = denom.reduce(function (acc, curr) { let value = 0; while (register[curr.name] > 0 && change >= curr.val) { change -= curr.val; register[curr.name] -= curr.val; value += curr.val; change = Math.round(change * 100) / 100; } if (value > 0) { acc.push([curr.name, value]); } return acc; }, []); if (change_arr.length < 1 || change > 0) { output.status = "INSUFFICIENT_FUNDS"; return output; } output.status = "OPEN"; output.change = change_arr; return output; } ```