js 数组里的对象去重

Question

需求是：如果数组的name相同，就比较下timestamp，哪个比较大保留哪个，小的去掉。数组如下：

var arr = [
    {name: "袜子", timestamp: 1537243392},
    {name: "月饼", timestamp: 1537243369},
    {name: "月饼", timestamp: 1537243411},
    {name: "女鞋", timestamp: 1537243241},
    {name: "童鞋", timestamp: 1537243204},        
];

希望得到的数组结果是：

var finalArr = [
    {name: "袜子", timestamp: 1537243392},
    {name: "月饼", timestamp: 1537243411},
    {name: "女鞋", timestamp: 1537243241},
    {name: "童鞋", timestamp: 1537243204},        
];

Answer 1

var&nbsp;arr&nbsp;=&nbsp;[ &nbsp;&nbsp;&nbsp;&nbsp;{name:&nbsp;"袜子",&nbsp;timestamp:&nbsp;1537243392}, &nbsp;&nbsp;&nbsp;&nbsp;{name:&nbsp;"月饼",&nbsp;timestamp:&nbsp;1537243369}, &nbsp;&nbsp;&nbsp;&nbsp;{name:&nbsp;"月饼",&nbsp;timestamp:&nbsp;1537243411}, &nbsp;&nbsp;&nbsp;&nbsp;{name:&nbsp;"女鞋",&nbsp;timestamp:&nbsp;1537243241}, &nbsp;&nbsp;&nbsp;&nbsp;{name:&nbsp;"童鞋",&nbsp;timestamp:&nbsp;1537243204}, ];var&nbsp;obj&nbsp;=&nbsp;{}; arr.forEach(v=>{&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(!obj[v.name]&nbsp;||&nbsp;obj[v.name].timestamp&nbsp;<&nbsp;v.timestamp)&nbsp;obj[v.name]&nbsp;=&nbsp;v; });console.log(Object.values(obj));