Question

我有一个对象数组。我需要组合阵列上具有相同键的所有对象。

这是原始数组：

PS C:\> $Obj1 = [PSCustomObject]@{
    Property1 = 'Value1'
    Property2 = 'Value2'
    Property3 = 'Value3'
    Property4 = 'Value4'
    Property5 = 'Value5'
}
PS C:\> $Obj2 = [PSCustomObject]@{
    Property1 = 'Value1'
    Property2 = 'Value2'
    Property3 = 'Value3'
    Property4 = 'Value4'
    Property5 = 'Value5'
}
PS C:\> Test-Objects $Obj1 $Obj2
True
PS C:\> $Obj2 | Add-Member -MemberType 'NoteProperty' -Name 'Prop6' -Value 'Value6'
PS C:\> Test-Objects $Obj1 $Obj2
False

我需要组合对象，以便输出如下：

[
    {
        foo: "A",
        bar: [
            { baz: "1", qux: "a" },
            { baz: "2", qux: "b" }
        ]
    },
    {
        foo: "B",
        bar: [
            { baz: "3", qux: "c" },
            { baz: "4", qux: "d" }
        ]
    },
    {
        foo: "A",
        bar: [
            { baz: "5", qux: "e" },
            { baz: "6", qux: "f" }
        ]
    },
    {
        foo: "B",
        bar: [
            { baz: "7", qux: "g" },
            { baz: "8", qux: "h" }
        ]
    }
]

如何使用lodash或javascript实现此目的？

Answer 1

您可以使用哈希表过滤和更新数据。

此提案改变了原始数据集。

var array = [{ foo: "A", bar: [{ baz: "1", qux: "a" }, { baz: "2", qux: "b" }] }, { foo: "B", bar: [{ baz: "3", qux: "c" }, { baz: "4", qux: "d" }] }, { foo: "A", bar: [{ baz: "5", qux: "e" }, { baz: "6", qux: "f" }] }, { foo: "B", bar: [{ baz: "7", qux: "g" }, { baz: "8", qux: "h" }] }],
    hash = Object.create(null),
    result = array.filter(function (o) {
        if (!hash[o.foo]) {
            hash[o.foo] = o.bar;
            return true;
        }
        Array.prototype.push.apply(hash[o.foo], o.bar);
    });

console.log(result);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 2

使用_.groupBy()，然后使用_.mergeWith()将每个组合并为一个对象：

＆＃13;

const data = [{"foo":"A","bar":[{"baz":"1","qux":"a"},{"baz":"2","qux":"b"}]},{"foo":"B","bar":[{"baz":"3","qux":"c"},{"baz":"4","qux":"d"}]},{"foo":"A","bar":[{"baz":"5","qux":"e"},{"baz":"6","qux":"f"}]},{"foo":"B","bar":[{"baz":"7","qux":"g"},{"baz":"8","qux":"h"}]}];

const result = _(data)
  .groupBy('foo')
  .map((g) => _.mergeWith({}, ...g, (obj, src) =>
      _.isArray(obj) ? obj.concat(src) : undefined))
  .value();
  
console.log(result);

＆＃13;

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>

＆＃13;

使用lodash将对象与相同的键组合在一起

2 个答案: