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我正在构建一个JavaScript收银机，根据收银机中的内容返回更改。这是一个freeCodeCamp挑战：https://www.freecodecamp.org/challenges/exact-change多维数组：使用相同字符串值求和的数值
不幸的是我很接近但卡住了。
我有一个叫做addResult()的函数，它有两个参数，name和val。
var result = [];
function addResult(name, val){
result.push([name, val]);
}
因此，如果所需的更改是$ 18，那么函数将构建一个像这样的数组。
[["ONE", 1.00], ["ONE", 1.00], ["ONE", 1.00], ["FIVE", 5.00], ["TEN", 10.00]]
我想要的功能来构建它像这个：
[["ONE", 3.00], ["FIVE", 5.00], ["TEN", 10.00]]
所以我需要有唯一的字符串名称，但总结起来的数字，但我不能工作如何。
如果任何人有兴趣完整的代码，那就是：
function checkCashRegister(price, cash, cid) {
var totalCash = Math.round(calculateTotalCash()).toFixed(2);
var changeDue = (cash - price) * 100; // 50
var result = [];
var monies = [
{name: 'PENNY', val: 1},
{name: 'NICKEL', val: 5},
{name: 'DIME', val: 10},
{name: 'QUARTER', val: 25},
{name: 'ONE', val: 100},
{name: 'FIVE', val: 500},
{name: 'TEN', val: 1000},
{name: 'TWENTY', val: 2000},
{name: 'ONE HUNDRED', val: 10000}
];
function calculateTotalCash(){
var result = 0;
for (var i = 0; i < cid.length; i++) {
result = result + cid[i][1];
}
return result;
}
function getQuantity(name){
for (var i = 0; i < cid.length; i++) {
if (cid[i][0] == name) {
return ((cid[i][1]) * 100)/monies[i].val;
}
}
};
function addResult(name, val){
result.push([name, val]);
}
var changeCount = changeDue; // 50
var i = monies.length - 1; // 8
var result = [];
while (changeCount > 0 && i > 0) {
// get the number of currencies left in the drawer
var quantity = getQuantity(monies[i].name);
// console.log(quantity, monies[i].name);
// alert(i);
// if the currency is smaller then the change left and there are currencies left
if (monies[i].val <= changeCount && quantity > 0) {
// subtract the currency from the change
changeCount = changeCount - monies[i].val;
// and withdraw the money from the drawer
cid[i][1] = ((cid[i][1] * 100) - monies[i].val)/100;
addResult(monies[i].name, monies[i].val);
} else {
// move on to the next smallest currency and try again
i--;
}
}
console.log(result);
if (changeCount > 0) {
return
}
// console.log(changeCount/100);
return changeCount;
}
// Example cash-in-drawer array:
// [["PENNY", 1.01],
// ["NICKEL", 2.05],
// ["DIME", 3.10],
// ["QUARTER", 4.25],
// ["ONE", 90.00],
// ["FIVE", 55.00],
// ["TEN", 20.00],
// ["TWENTY", 60.00],
// ["ONE HUNDRED", 100.00]]
checkCashRegister(19.50, 20.00, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.10], ["QUARTER", 4.25], ["ONE", 90.00], ["FIVE", 55.00], ["TEN", 20.00], ["TWENTY", 60.00], ["ONE HUNDRED", 100.00]]);
// get the change due
// loop through the change
// check if the highest monie is greater than the change
// if it is move on to the next lowest
// when you find one that is lesser than the change subtract it from the change
// if there is still leftover change required try and subtract again
// check if it is higher than the change
// do this untill the exact change is matched