javascript - 对循环中的对象数组应用折扣，无论哪个对象的支付值较高？

Question

我有一组具有 key 付费的对象。我想使用循环对所有对象应用折扣，除了付费值较高的对象。

var booking = [
{id:1,paid:200,currency:'USD'},
{id:2,paid:99,currency:'USD'},
{id:3,paid:100,currency:'USD'},
]

在上面的对象名称数组booking上，我想通过在该对象中添加键discount:true来进行循环并应用折扣，除了更高的paid > 值对象。

这就是循环后我想要的

var booking = [
{id:1,paid:200,currency:'USD'},
{id:2,paid:99,currency:'USD',discount:true},
{id:3,paid:100,currency:'USD',discount:true},
]

Answer 1

您可以先获取最大付费值，然后根据需要应用新属性。

const
    booking = [{ id: 1, paid: 200, currency: 'USD' }, { id: 2, paid: 99, currency: 'USD' }, { id: 3, paid: 100, currency: 'USD' }],
    max = Math.max(...booking.map(({ paid }) => paid)),
    result = booking.map(o => ({ ...o, ...o.paid === max || { discount: true } }));

console.log(result);

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