我在试着弄清楚两个物体之间的区别
previousChart: {BWP: 1, ZAR: 1.3, USD: 0.09324, number: 1},
currentChart: {BWP: 1, ZAR: 1.35, USD: 0.01, number: 2}
想要的答案是:
newObject ={BWP: 0, ZAR: 0.05, USD: 0.08324, number: -1}
请不要问我做了什么,因为这是最后一个阶段,因为这是我代码的最后部分,如果你有兴趣知道我在这里做了什么:
rates = [
{BWP: 1, ZAR: 1.3, USD: 0.09324, number: 1},
{BWP: 1, ZAR: 1.35, USD: 0.01, number: 2},
{BWP: 1, ZAR: 1.3456, USD: 0.09234, number: 3},
{BWP: 1, ZAR: 1.27894, USD: 0.06788, number: 4}
]
newRate = [];
for(let i in rates){
if( i - 1 === -1 ){
previousChart = rates[0];
}else{
previousChart = rates[i - 1];
}
let currentChart = rates[i];
}
发布于 2018-06-25 03:09:18
您可以只遍历一个对象的Object.keys()
,然后使用reduce()
减去另一个对象。这假设两个对象具有相同的关键字。
let previousChart = {BWP: 1, ZAR: 1.3, USD: 0.09324, number: 1};
let currentChart = {BWP: 1, ZAR: 1.35, USD: 0.01, number: 2};
let newObj = Object.keys(previousChart).reduce((a, k) => {
a[k] = previousChart[k] - currentChart[k];
return a;
}, {});
console.log(newObj);
当然,您可以添加一些代码来将浮点处理到所需的精度。
您可以将其转换为一个函数,这将允许您轻松地处理一组值并将它们全部相减:
let rates = [
{BWP: 1, ZAR: 1.3, USD: 0.09324, number: 1},
{BWP: 1, ZAR: 1.35, USD: 0.01, number: 2},
{BWP: 1, ZAR: 1.3456, USD: 0.09234, number: 3},
{BWP: 1, ZAR: 1.27894, USD: 0.06788, number: 4}
];
function subtract(r1, r2) {
return Object.keys(r1).reduce((a, k) => {
a[k] = r1[k] - r2[k];
return a;
}, {});
}
let total = rates.reduce((a, c) => subtract(a, c));
// subtract all values of rates array
console.log(total);
发布于 2018-06-25 03:20:52
如果我没理解错的话,你要找的数组是前面几个数组中每个值的差。
让我们假设这是您的输入
rates = [
{BWP: 1, ZAR: 1.3, USD: 0.09324, number: 1},
{BWP: 1, ZAR: 1.35, USD: 0.01, number: 2},
{BWP: 1, ZAR: 1.3456, USD: 0.09234, number: 3},
{BWP: 1, ZAR: 1.27894, USD: 0.06788, number: 4}
]
你想要一个像这样的数组
{BWP: 1, ZAR: 1.3, USD: 0.09324, number: 1}
就是结果。这样就可以完成任务了
var rates = [
{BWP: 1, ZAR: 1.3, USD: 0.09324, number: 1},
{BWP: 1, ZAR: 1.35, USD: 0.01, number: 2},
{BWP: 1, ZAR: 1.3456, USD: 0.09234, number: 3},
{BWP: 1, ZAR: 1.27894, USD: 0.06788, number: 4}
]
// I use the last object as the "template"
var result = rates[rates.length - 1];
var keys = Object.keys(result);
for (var i = rates.length - 1; i > 0; i --) {
keys.forEach(function (elem) {
result[elem] -= rates[i-1][elem];
});
}
console.log(result);
https://stackoverflow.com/questions/51013088
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