--- id: aa2e6f85cab2ab736c9a9b24 title: Registrierkasse challengeType: 5 forumTopicId: 16012 dashedName: cash-register --- # --description-- Entwirf eine Registrierkassenfunktion `checkCashRegister()`, die als erstes Argument den Kaufpreis (`price`), als zweites Argument die Bezahlung (`cash`) und als drittes Argument den Kassenbestand (`cid`) akzeptiert. `cid` ist ein 2D-Array mit den verfügbaren Währungen. Die Funktion `checkCashRegister()` sollte immer ein Objekt mit einem Key `status` und einem Key `change` zurückgeben. Gib `{status: "INSUFFICIENT_FUNDS", change: []}` zurück, wenn der Kassenbestand geringer ist als das fällige Wechselgeld, oder wenn du das genaue Wechselgeld nicht zurückgeben kannst. Gib `{status: "CLOSED", change: [...]}` als Wert für den Key `change` zurück, wenn der Kassenbestand gleich dem fälligen Wechselgeld ist. Andernfalls wird `{status: "OPEN", change: [...]}`, mit dem fälligen Wechselgeld in Münzen und Scheinen, sortiert in der höchsten bis niedrigsten Reihenfolge, als Wert des Keys `change` zurückgegeben.
WährungseinheitAnzahl
Penny$0.01 (PENNY)
Nickel$0.05 (NICKEL)
Dime$0.1 (DIME)
Quarter$0.25 (QUARTER)
Dollar$1 (ONE)
Fünf Dollar$5 (FIVE)
Zehn Dollar$10 (TEN)
Zwanzig Dollar$20 (TWENTY)
Einhundert Dollar$100 (ONE HUNDRED)
Unten findest du ein Beispiel für Wechselgeld: ```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]])` sollte ein Objekt zurückgeben. ```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]])` sollte`{status: "OPEN", change: [["QUARTER", 0.5]]}` zurückgeben. ```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]])` sollte`{status: "OPEN", change: [["TWENTY", 60], ["TEN", 20], ["FIVE", 15], ["ONE", 1], ["QUARTER", 0.5], ["DIME", 0.2], ["PENNY", 0.04]]}` zurückgeben. ```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]])` sollte`{status: "INSUFFICIENT_FUNDS", change: []}` zurückgeben. ```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]])` sollte`{status: "INSUFFICIENT_FUNDS", change: []}` zurückgeben. ```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]])` sollte`{status: "CLOSED", change: [["PENNY", 0.5], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]]}` zurückgeben. ```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; } ```