根据Typescript

Question

我的json数据具有以下结构：

[
{"domain":"d1",
"technology":"Java",
"artifacts[{ 
  "artifactName":"app1",
  "hasVersionDiff":true,
  "environment":["DEV","SQA"],
  "version":["Not Available","1.0-R1"]
}]},

{"domain":"d2",
"technology":".net",
"artifacts[{ 
  "artifactName":"app4",
  "hasVersionDiff":false,
  "environment":["DEV","SQA"],
  "version":["1.0-R1","1.0-R1"]}]
}]

此结果是compareResults变量。现在，我试图根据每个记录的工件数据（hasVersionDiff标志为true）对此进行过滤。我正在尝试使用以下过滤器：

this.compareResults.map(function(ComparisonResult) {
        ComparisonResult.artifacts = ComparisonResult.artifacts.filter(x => x.hasVersionDiff == true)
    });

但是它没有过滤，有人可以解释为什么它不起作用吗？

Answer 1

由于map，您需要return新项目。 （我还修复了您的对象结构，使其有效）：

const compareResults = [{
    "domain": "d1",
    "technology": "Java",
    "artifacts": [{
      "artifactName": "app1",
      "hasVersionDiff": true,
      "environment": ["DEV", "SQA"],
      "version": ["Not Available", "1.0-R1"]
    }]
  },

  {
    "domain": "d2",
    "technology": ".net",
    "artifacts": [{
      "artifactName": "app4",
      "hasVersionDiff": false,
      "environment": ["DEV", "SQA"],
      "version": ["1.0-R1", "1.0-R1"]
    }]
  }
];

const modified = compareResults.map(function(ComparisonResult) {
  ComparisonResult.artifacts = ComparisonResult.artifacts.filter(x => x.hasVersionDiff);
  return ComparisonResult;
});

console.log(modified);

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

如果artifacts为空，则要删除整个对象：

const compareResults = [{
    "domain": "d1",
    "technology": "Java",
    "artifacts": [{
      "artifactName": "app1",
      "hasVersionDiff": true,
      "environment": ["DEV", "SQA"],
      "version": ["Not Available", "1.0-R1"]
    }]
  },

  {
    "domain": "d2",
    "technology": ".net",
    "artifacts": [{
      "artifactName": "app4",
      "hasVersionDiff": false,
      "environment": ["DEV", "SQA"],
      "version": ["1.0-R1", "1.0-R1"]
    }]
  }
];

const modified = compareResults.map(function(ComparisonResult) {
  ComparisonResult.artifacts = ComparisonResult.artifacts.filter(x => x.hasVersionDiff);
  return ComparisonResult;
}).filter(({ artifacts }) => artifacts.length);

console.log(modified);

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

Answer 2

我实现了递归函数，通过它可以从上到下逐层过滤嵌套的对象数组。在 TS playground

中探索、播放和修改我的脚本