在類似數組的對象中查找最小值和最大值

Question

我正在嘗試從數組中找到最小值和最大值

嘗試了各種方法，但是找不到滿足我需求的解決方案

我有一個像數組對象

它的值是

{
    0:exchange:bitfix

    totaleth:334

    1:exchange:coinbase

    totaleth:6000

    2:exchange:koinex

    totaleth:3000
}

現在這個對象就像一個數組，我想顯示基於totaleth字段的最小值和最大值，請問任何一個都有解決方案

我嘗試了諸如map reduce for loop之類的各種操作，似乎沒有任何作用

Answer 1

假設有一個對象數組，則可以通過采用最小值和最大值來縮小數組。

 var array = [{ exchange: 'bitfix', totaleth: 334 }, { exchange: 'coinbase', totaleth: 6000 }, { exchange: 'koinex', totaleth: 3000 }], { min, max } = array.reduce( (r, o, i) => i ? { min: r.min.totaleth < o.totaleth ? r.min : o, max: r.max.totaleth > o.totaleth ? r.max : o } : { min: o, max: o }, undefined ); console.log('min', min); console.log('max', max); 

Answer 2

好的，因此您可以使用排序功能，但是請記住，它會修改原始數組。

const someArr = [{"_id":"5c585ed5a9a5b931c3057d48","exchange":"Poloniex","totaleth":-338,"dt":"2019-02-04T15:48:37.232Z","__v":0},{"_id":"5c585ed5a9a5b931c3057d47","exchange":"Bitrex","totaleth":-227,"dt":"2019-02-04T15:48:37.222Z","__v":0},{"_id":"5c585ed5a9a5b931c3057d46","exchange":"Gemini","totaleth":86,"dt":"2019-02-04T15:48:37.220Z","__v":0},{"_id":"5c585ed5a9a5b931c3057d45","exchange":"Bitfinex","totaleth":-373,"dt":"2019-02-04T15:48:37.219Z","__v":0},{"_id":"5c585ed4a9a5b931c3057d44","exchange":"Binance","totaleth":6531,"dt":"2019-02-04T15:48:36.586Z","__v":0}];

console.log(
  someArr.sort((a, b) => {
    return a.totaleth - b.totaleth;
  })
);

Answer 3

您的代碼成功了，非常感謝nina scholz

 var array = [{ exchange: 'bitfix', totaleth: 334 }, { exchange: 'coinbase', totaleth: 6000 }, { exchange: 'koinex', totaleth: 3000 }], { min, max } = array.reduce( (r, o, i) => i ? { min: r.min.totaleth < o.totaleth ? r.min : o, max: r.max.totaleth > o.totaleth ? r.max : o } : { min: o, max: o }, undefined ); console.log('min', min); console.log('max', max);