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https://github.com/freeCodeCamp/freeCodeCamp.git
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Shaun Hamilton
254 lines
6.9 KiB
Markdown
254 lines
6.9 KiB
Markdown
---
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id: aa2e6f85cab2ab736c9a9b24
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title: Cash Register
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challengeType: 5
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saveSubmissionToDB: true
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forumTopicId: 16012
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dashedName: cash-register
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---
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# --description--
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Design a cash register drawer function `checkCashRegister()` that accepts purchase price as the first argument (`price`), payment as the second argument (`cash`), and cash-in-drawer (`cid`) as the third argument.
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`cid` is a 2D array listing available currency.
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The `checkCashRegister()` function should always return an object with a `status` key and a `change` key.
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Return `{status: "INSUFFICIENT_FUNDS", change: []}` if cash-in-drawer is less than the change due, or if you cannot return the exact change.
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Return `{status: "CLOSED", change: [...]}` with cash-in-drawer as the value for the key `change` if it is equal to the change due.
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Otherwise, return `{status: "OPEN", change: [...]}`, with the change due in coins and bills, sorted in highest to lowest order, as the value of the `change` key.
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<table><tbody><tr><th>Currency Unit</th><th>Amount</th></tr><tr><td>Penny</td><td>$0.01 (PENNY)</td></tr><tr><td>Nickel</td><td>$0.05 (NICKEL)</td></tr><tr><td>Dime</td><td>$0.1 (DIME)</td></tr><tr><td>Quarter</td><td>$0.25 (QUARTER)</td></tr><tr><td>Dollar</td><td>$1 (ONE)</td></tr><tr><td>Five Dollars</td><td>$5 (FIVE)</td></tr><tr><td>Ten Dollars</td><td>$10 (TEN)</td></tr><tr><td>Twenty Dollars</td><td>$20 (TWENTY)</td></tr><tr><td>One-hundred Dollars</td><td>$100 (ONE HUNDRED)</td></tr></tbody></table>
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See below for an example of a cash-in-drawer array:
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```js
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[
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["PENNY", 1.01],
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["NICKEL", 2.05],
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["DIME", 3.1],
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["QUARTER", 4.25],
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["ONE", 90],
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["FIVE", 55],
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["TEN", 20],
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["TWENTY", 60],
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["ONE HUNDRED", 100]
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]
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```
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# --hints--
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`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]])` should return an object.
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```js
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assert.deepEqual(
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Object.prototype.toString.call(
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checkCashRegister(19.5, 20, [
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['PENNY', 1.01],
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['NICKEL', 2.05],
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['DIME', 3.1],
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['QUARTER', 4.25],
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['ONE', 90],
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['FIVE', 55],
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['TEN', 20],
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['TWENTY', 60],
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['ONE HUNDRED', 100]
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])
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),
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'[object Object]'
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);
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```
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`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]])` should return `{status: "OPEN", change: [["QUARTER", 0.5]]}`.
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```js
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assert.deepEqual(
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checkCashRegister(19.5, 20, [
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['PENNY', 1.01],
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['NICKEL', 2.05],
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['DIME', 3.1],
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['QUARTER', 4.25],
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['ONE', 90],
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['FIVE', 55],
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['TEN', 20],
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['TWENTY', 60],
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['ONE HUNDRED', 100]
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]),
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{ status: 'OPEN', change: [['QUARTER', 0.5]] }
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);
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```
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`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]])` should return `{status: "OPEN", change: [["TWENTY", 60], ["TEN", 20], ["FIVE", 15], ["ONE", 1], ["QUARTER", 0.5], ["DIME", 0.2], ["PENNY", 0.04]]}`.
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```js
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assert.deepEqual(
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checkCashRegister(3.26, 100, [
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['PENNY', 1.01],
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['NICKEL', 2.05],
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['DIME', 3.1],
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['QUARTER', 4.25],
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['ONE', 90],
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['FIVE', 55],
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['TEN', 20],
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['TWENTY', 60],
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['ONE HUNDRED', 100]
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]),
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{
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status: 'OPEN',
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change: [
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['TWENTY', 60],
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['TEN', 20],
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['FIVE', 15],
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['ONE', 1],
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['QUARTER', 0.5],
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['DIME', 0.2],
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['PENNY', 0.04]
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]
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}
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);
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```
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`checkCashRegister(19.5, 20, [["PENNY", 0.01], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]])` should return `{status: "INSUFFICIENT_FUNDS", change: []}`.
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```js
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assert.deepEqual(
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checkCashRegister(19.5, 20, [
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['PENNY', 0.01],
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['NICKEL', 0],
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['DIME', 0],
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['QUARTER', 0],
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['ONE', 0],
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['FIVE', 0],
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['TEN', 0],
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['TWENTY', 0],
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['ONE HUNDRED', 0]
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]),
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{ status: 'INSUFFICIENT_FUNDS', change: [] }
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);
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```
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`checkCashRegister(19.5, 20, [["PENNY", 0.01], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 1], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]])` should return `{status: "INSUFFICIENT_FUNDS", change: []}`.
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```js
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assert.deepEqual(
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checkCashRegister(19.5, 20, [
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['PENNY', 0.01],
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['NICKEL', 0],
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['DIME', 0],
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['QUARTER', 0],
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['ONE', 1],
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['FIVE', 0],
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['TEN', 0],
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['TWENTY', 0],
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['ONE HUNDRED', 0]
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]),
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{ status: 'INSUFFICIENT_FUNDS', change: [] }
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);
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```
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`checkCashRegister(19.5, 20, [["PENNY", 0.5], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]])` should return `{status: "CLOSED", change: [["PENNY", 0.5], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]]}`.
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```js
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assert.deepEqual(
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checkCashRegister(19.5, 20, [
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['PENNY', 0.5],
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['NICKEL', 0],
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['DIME', 0],
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['QUARTER', 0],
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['ONE', 0],
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['FIVE', 0],
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['TEN', 0],
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['TWENTY', 0],
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['ONE HUNDRED', 0]
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]),
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{
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status: 'CLOSED',
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change: [
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['PENNY', 0.5],
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['NICKEL', 0],
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['DIME', 0],
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['QUARTER', 0],
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['ONE', 0],
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['FIVE', 0],
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['TEN', 0],
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['TWENTY', 0],
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['ONE HUNDRED', 0]
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]
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}
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);
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```
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# --seed--
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## --seed-contents--
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```js
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function checkCashRegister(price, cash, cid) {
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let change;
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return change;
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}
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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]]);
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```
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# --solutions--
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```js
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const denom = [
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{ name: "ONE HUNDRED", val: 100 },
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{ name: "TWENTY", val: 20 },
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{ name: "TEN", val: 10 },
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{ name: "FIVE", val: 5 },
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{ name: "ONE", val: 1 },
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{ name: "QUARTER", val: 0.25 },
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{ name: "DIME", val: 0.1 },
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{ name: "NICKEL", val: 0.05 },
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{ name: "PENNY", val: 0.01 },
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];
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function checkCashRegister(price, cash, cid) {
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const output = { status: null, change: [] };
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let change = cash - price;
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const register = cid.reduce(
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function (acc, curr) {
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acc.total += curr[1];
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acc[curr[0]] = curr[1];
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return acc;
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},
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{ total: 0 }
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);
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if (register.total === change) {
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output.status = "CLOSED";
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output.change = cid;
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return output;
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}
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if (register.total < change) {
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output.status = "INSUFFICIENT_FUNDS";
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return output;
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}
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const change_arr = denom.reduce(function (acc, curr) {
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let value = 0;
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while (register[curr.name] > 0 && change >= curr.val) {
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change -= curr.val;
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register[curr.name] -= curr.val;
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value += curr.val;
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change = Math.round(change * 100) / 100;
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}
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if (value > 0) {
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acc.push([curr.name, value]);
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}
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return acc;
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}, []);
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if (change_arr.length < 1 || change > 0) {
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output.status = "INSUFFICIENT_FUNDS";
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return output;
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}
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output.status = "OPEN";
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output.change = change_arr;
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return output;
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}
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```
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