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freeCodeCamp/curriculum/challenges/portuguese/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/cash-register.md

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id, title, challengeType, forumTopicId, dashedName
id title challengeType forumTopicId dashedName
aa2e6f85cab2ab736c9a9b24 Caixa Registradora 5 16012 cash-register

--description--

Implemente uma função de registradora de caixa checkCashRegister() que aceita o preço de compra como o primeiro argumento (price), pagamento como o segundo argumento (cash) e dinheiro na registradora (cid) como o terceiro argumento.

cid é um array de duas dimensões listando a moeda disponível e a quantidade.

A função checkCashRegister() deve sempre retornar um objeto com a chave status e uma chave change.

Retorne {status: "INSUFFICIENT_FUNDS", change: []} se o dinheiro no caixa for menor que o troco devido, ou se você não pode retornar o troco exato.

Retorne {status: "CLOSED", change: [...]} com dinheiro no caixa como o valor para a chave change se for igual ao troco devido.

Caso contrário, retorne {status: "OPEN", change: [...]}, com o troco devido em moedas e notas, ordenado do maior para o menor, como o valor da chave change.

Unidade de moedaQuantidade
Penny$0,01 (MET)
Níquel$0,05 (NICKEL)
Dime$0,1 (DIME)
Quarter$0,25 (QUARTER)
Dólar$1 (UM)
Cinco Dólares$5 (CINCO)
Dez Dólares$10 (DEZ)
Vinte Dólares$20 (VINTE)
Cem Dólares$100 (CEM)

Veja abaixo um exemplo de um array de dinheiro no caixa (cid):

[
  ["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]]) deve retornar um objeto.

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]]) deve retornar {status: "OPEN", change: [["QUARTER", 0.5]]}.

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]]) deve retornar {status: "OPEN", change: [["TWENTY", 60], ["TEN", 20], ["FIVE", 15], ["ONE", 1], ["QUARTER", 0.5], ["DIME", 0.2], ["PENNY", 0.04]]}.

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]]) deve retornar {status: "INSUFFICIENT_FUNDS", change: []}.

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]]) deve retornar {status: "INSUFFICIENT_FUNDS", change: []}.

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]]) deve retornar {status: "CLOSED", change: [["PENNY", 0.5], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]]}.

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--

function checkCashRegister(price, cash, cid) {
  var 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--

var 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) {
 var output = {status: null, change: []};
 var change = cash - price;
 var 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;
 }
 var change_arr = denom.reduce(function(acc, curr) {
 var 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;
}