将多个对象数组转换为单个对象

Question

问题：有超过 100 个可能的不同键返回的未类型化对象。 我想将所有错误对象（无论类型如何）转换为单个对象。

const input = [
    {
        "type":"cat",
        "errors":[
            {
                "keyA":"This is wrong!",
                "keyB":"This is more wrong!!",
                "keyC":"...horrible, just horrible"
            }
        ]
    },
    {
        "type":"dog",
        "errors":[
            {
                "key1":"whoops",
                "key2":"somebody has a typo"
            },
            {
                "keyX":"umm...really?",
                "keyY":"when did it start raining?"
            }
        ]
    }
]

预期产出=

            {
                "keyA":"This is wrong!",
                "keyB":"This is more wrong!!",
                "keyC":"...horrible, just horrible",
                "key1":"whoops",
                "key2":"somebody has a typo",
                "keyX":"umm...really?",
                "keyY":"when did it start raining?"
            }

我目前的尝试（有效）看起来像这样。但是我认为它可能不需要减少调用。有没有更简单的方法？

const returnVal = val.reduce((acc,curr) => {
    return ([...acc.errors, ...curr.errors] as any).reduce((a: any, c: any) => ({...a, ...c}), {});
});

Answer 1

使用

Array.flatMap()

获取对象数组，然后通过展开成

Object.assign()

将它们合并为单个对象：

const input = [{"type":"cat","errors":[{"keyA":"This is wrong!","keyB":"This is more wrong!!","keyC":"...horrible, just horrible"}]},{"type":"dog","errors":[{"key1":"whoops","key2":"somebody has a typo"},{"keyX":"umm...really?","keyY":"when did it start raining?"}]}]

const result = Object.assign({}, ...input.flatMap(o => o.errors))

console.log(result)

使用 TS，你需要给对象一个通用类型，因为

errors

对象具有随机属性（TS playground）：

interface InputObject {
    type: string;
    errors: Record<string, string>[]
}

const input: InputObject[] = [{"type":"cat","errors":[{"keyA":"This is wrong!","keyB":"This is more wrong!!","keyC":"...horrible, just horrible"}]},{"type":"dog","errors":[{"key1":"whoops","key2":"somebody has a typo"},{"keyX":"umm...really?","keyY":"when did it start raining?"}]}]

const result = Object.assign({}, ...input.flatMap(o => o.errors as Object))

console.log(result)