JavaScript:根据不同的对象数组编译对象数组

Question

我有一个发票数组，我想根据值invoiceMonth(例如“2014年2月”)编译monthlyIncome的有序列表”)。 monthlyIncome 数组必须存储月份名称和该月的收入，即

monthlyIncome = [
    { name: 'January 2014', income: 1000}, 
    { name: 'February 2014', income: 1500 } 
    ...
];

基本上我需要的是一种“更深”的indexOf(val)，它会检查val是否在任何对象的指定属性中MonthlyIncome，然后返回该索引。在此示例中，我使用 deepIndexOf(value, property)。

for (var i=0; i<invoices.length; i++) {
    var index = monthlyIncome.deepIndexOf(invoices[i].invoiceMonth, 'name');
    if (index > -1) {
        // month already exists in list, so add the total
        monthlyIncome[index].income += invoice.total;
    } else {
        // month doesn't exist, so add it
        monthlyIncome.push({ 
            name: invoices[i].invoiceMonth, 
            income: invoices[i].total 
        });
    }
}

唯一的问题是我不知道如何编写 deepIndexOf。另外，我怀疑在 JavaScript 中存在比我概述的方法更好的方法。

Answer 1

您的 deepIndexOf 函数可以是这样的:

function deepIndexOf(array, key, value) {
    var obj;
    for (var idx = 0; idx < array.length; idx++) {
        var obj = array[idx];
        if (obj[key] === value) {
            return idx;
        }
    }
    return -1;
}

var monthlyIncome = [{
    name: 'January 2014',
    income: 1000
}, {
    name: 'February 2014',
    income: 1500
}];

console.log(deepIndexOf(monthlyIncome, 'name', 'January 2014'));
console.log(deepIndexOf(monthlyIncome, 'name', 'February 2014'));
console.log(deepIndexOf(monthlyIncome, 'name', 'None 2014'));

或者，要编译的整个代码可以是这样的:

function compile(incomeList, invoice) {
    var found = false;
    for (var i = 0; i < incomeList.length && !found; i++) {
        if (incomeList[i].name === invoice.invoiceMonth) {
            incomeList[i].income += invoice.total;
            found = true;
        }
    }
    if (!found) {
        incomeList.push({
            name: invoice.invoiceMonth,
            income: invoice.total
        });
    }

}

compile(monthlyIncome, {
    invoiceMonth: 'January 2014',
    total: 1000
});
compile(monthlyIncome, {
    invoiceMonth: 'March 2014',
    total: 1000
});