找到有條件的物件陣列的最小值

    let event = [
    {
        "vendorBidId": 58,
        "participantName": "[email protected]",
        "bidAmount": 10000,
        "productionRate": 10000,
        "bidTime": "2021-10-21T14:55:05.957324",
        "isYou": false,
        "awarded": false
    },
    {
        "vendorBidId": 57,
        "participantName": "[email protected]",
        "bidAmount": 20000,
        "productionRate": 20000,
        "bidTime": "2021-10-21T14:50:24.493522",
        "isYou": false,
        "awarded": true
    },
    {
        "vendorBidId": null,
        "participantName": "bro [email protected]",
        "bidAmount": 0,
        "productionRate": null,
        "bidTime": null,
        "isYou": false,
        "awarded": false
    },
    {
        "vendorBidId": null,
        "participantName": "[email protected]",
        "bidAmount": 0,
        "productionRate": null,
        "bidTime": null,
        "isYou": true,
        "awarded": false
    }
]

在這里我想找到最低出價金額，但在檢查以下條件后，

1. 如果 vendorBidId 為空則跳過

我試著這樣做。

let minimum = event.reduce(function(prev, curr) {
    return prev.bidAmount < curr.bidAmount ? prev : curr;
});

但是并嘗試添加我的條件。但效果不佳。

我只想要最小的出價金額（跳過 vendorBidId 為空）。

uj5u.com熱心網友回復：

過濾器和地圖上的 Math.min

let event = [{ "vendorBidId": 58, "participantName": "[email protected]", "bidAmount": 10000, "productionRate": 10000, "bidTime": "2021-10-21T14:55:05.957324", "isYou": false, "awarded": false }, { "vendorBidId": 57, "participantName": "[email protected]", "bidAmount": 20000, "productionRate": 20000, "bidTime": "2021-10-21T14:50:24.493522", "isYou": false, "awarded": true }, { "vendorBidId": null, "participantName": "bro [email protected]", "bidAmount": 0, "productionRate": null, "bidTime": null, "isYou": false, "awarded": false }, { "vendorBidId": null, "participantName": "[email protected]", "bidAmount": 0, "productionRate": null, "bidTime": null, "isYou": true, "awarded": false } ]

const min = Math.min(...event
  .filter(evt => evt.vendorBidId)
  .map(({bidAmount}) => bidAmount)
);  

console.log(min)

uj5u.com熱心網友回復：

使用reduce是一種簡單的方法（如果您想要整個物件）。

如果您只需要最小 vakue，您可以Math.min在映射 minAmount 鍵值后使用。

  let event = [
    {
        "vendorBidId": 58,
        "participantName": "[email protected]",
        "bidAmount": 10000,
        "productionRate": 10000,
        "bidTime": "2021-10-21T14:55:05.957324",
        "isYou": false,
        "awarded": false
    },
    {
        "vendorBidId": 57,
        "participantName": "[email protected]",
        "bidAmount": 20000,
        "productionRate": 20000,
        "bidTime": "2021-10-21T14:50:24.493522",
        "isYou": false,
        "awarded": true
    },
    {
        "vendorBidId": null,
        "participantName": "bro [email protected]",
        "bidAmount": 0,
        "productionRate": null,
        "bidTime": null,
        "isYou": false,
        "awarded": false
    },
    {
        "vendorBidId": null,
        "participantName": "[email protected]",
        "bidAmount": 0,
        "productionRate": null,
        "bidTime": null,
        "isYou": true,
        "awarded": false
    }
]

const min = event.reduce(function(prev, curr) {
    return prev.bidAmount < curr.bidAmount && curr.vendorBidId ? prev : curr;
});

console.log(min);

var minValue = Math.min(...event.map(item => item.vendorBidId ?   item.bidAmount : 0));

console.log(minValue);

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