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javascript - 如何过滤地图字段数组

问题描述

我有以下项目数组，我映射这些项目以获得结果

 var items = $.grep($.selections);

其中项目如下所示：

0: {ID: "310882", Type: "W", Total: 10}
1: {ID: "31094", Type: "W",  Total: 10}
2: {ID: "307969", Type: "W",  Total: 10}
3: {ID: "311951", Type: "W",Total: 10}
4: {ID: "ItemCover_1611315351331", Type: "F", Total: 5, AmountDue:55}

所以我想做的是得到所有我可以的总计如下

var AllTotal=items.map(x => x.Total);

这给了我以下结果

0: 10
1: 10
2: 10
3: 10
4: 5

如果你注意到数组中的这个项目，我的问题

4: {ID: "ItemCover_1611315351331", Type: "F", Total: 5, AmountDue:55}

它有一个 ID：以“ItemCover”开头，它的 AmountDue 为 55

当我有这种性质的项目时，我如何过滤掉总计 5 个并将其替换为应付金额，以便它现在看起来像这样

var AllTotal
   0: 10
    1: 10
    2: 10
    3: 10
    4: 55

标签： javascriptjquery

解决方案

假设您想要 AmountDue（如果存在）的最简单版本

const arr = [{ID: "310882", Type: "W", Total: 10},
 {ID: "31094", Type: "W",  Total: 10},
 {ID: "307969", Type: "W",  Total: 10},
 {ID: "311951", Type: "W",Total: 10},
 {ID: "ItemCover_1611315351331", Type: "F", Total: 5, AmountDue:55}];

 const newArr = arr.map(({Total,AmountDue}) => AmountDue || Total)

 console.log(newArr)

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