将对象的前两个键的数组作为新对象中的键，将第三个键作为该对象中的数组

Question

我有从 csv 文件中读取的 JSON 数据。我希望能够从所有对象中获取测试、结果，并在每个对象中匹配测试、结果并在其中包含指标数组。

[{
    "Test": "GGT",
    "Result": "High",
    "Indicator": "Alcohol abuse Liver Disease"
}, {
    "Test": "GGT",
    "Result": "High",
    "Indicator": "Congestive Heart Failure"
}, {
    "Test": "GGT",
    "Result": "High",
    "Indicator": "Drugs: NSAIDs"
}, {
    "Test": "GGT",
    "Result": "High",
    "Indicator": "Drugs: Lipid lowering drugs"
}, {
    "Test": "GGT",
    "Result": "High",
    "Indicator": "Drugs: Antibiotics"
}, {
    "Test": "GGT",
    "Result": "High",
    "Indicator": "Drugs: Histamine Blockers"
}, {
    "Test": "GGT",
    "Result": "High",
    "Indicator": "Drugs: Antifungals"
}, {
    "Test": "GGT",
    "Result": "High",
    "Indicator": "Drugs: anticonvulsants"
}, {
    "Test": "GGT",
    "Result": "High",
    "Indicator": "Drugs: antidepressants"
}, {
    "Test": "GGT",
    "Result": "High",
    "Indicator": "Drugs: testoserone"
}, {
    "Test": "GGT",
    "Result": "Low",
    "Indicator": "No concern"
}, {
    "Test": "GGT",
    "Result": "Low",
    "Indicator": "unlikely liver disease"
}, {
    "Test": "GGT",
    "Result": "Low",
    "Indicator": "Drugs: Oral contraceptives"
}, {
    "Test": "GGT",
    "Result": "Low",
    "Indicator": "Drugs: Clofibrate"
}, {
    "Test": "AST",
    "Result": "High",
    "Indicator": "(if >10xULN) acute hepatitis"
}]

我希望能够像这样解析它

[
    {
        Test: "GGT",
        Result: "High",
        Indicators: [
            "Alcohol abuse Liver Disease",
            "Congestive Heart Failure",
            "Drugs: NSAIDs",
            "Drugs: Lipid lowering drugs",
            "Drugs: Antibiotics",
            "Drugs: Histamine Blockers",
        ],
    },
    {
        Test: "GGT",
        Result: "Low",
        Indicators: ["unlikely liver disease", "Drugs: Oral contraceptives", "Drugs: Clofibrate"],
    },
]

我跳过了结果中的记录，但我相信你明白了。我想将测试、结果键映射在一起并制作一个指标数组。请帮助我。

Answer 1

您想使用 reducer 函数，因此您可以遍历数组并返回一个新对象数组。在 reducer 中，您可能希望检查累积数组中是否存在现有的“Result”属性，然后将当前的“Indicator”添加到该对象列表中。

查看这里了解更多信息https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce

对我来说，它看起来像这样：

const list = [{a: 'v1', b: 'value'},{a: 'v2', b: 'value'},{a: 'v1', b: 'value2'}];

const result = list.reduce((accumulator, current) => {
  const idx = accumulator.findIndex((item) => item.a == current.a);
  if(idx == -1) {
    accumulator.push({a: current.a, values: [current.b]});
    return accumulator;
  }
  accumulator[idx].values.push(current.b);
  return accumulator;
}, []);