Question

我在javascript中有一个JSON对象列表，如下所示：

[{"model":"alpha", "ports":4},
{"model":"beta", "ports":4},
{"model":"beta", "ports":1},
{"model":"beta", "ports":43},
{"model":"gamma", "ports":66},
{"model":"omega", "ports":6},
{"model":"omega", "ports":1}]

现在我需要找出具有相同model值的所有行，然后在第一个项目中添加include键，最后生成include的值key是其余“相同模型”行的列表。

输出应该是这样的：

[{"model":"alpha", "ports":4},
{"model":"beta", "ports":4, "include":[
{"model":"beta", "ports":1},
{"model":"beta", "ports":43}]},
{"model":"gamma", "ports":66},
{"model":"omega", "ports":6, "include":[
{"model":"omega", "ports":1}]}]

任何人都可以给我一个如何实现这个目标的方向吗？

Answer 1

您可以使用forEach循环和thisArg参数

执行此操作

var data = [{"model":"alpha", "ports":4},
{"model":"beta", "ports":4},
{"model":"beta", "ports":1},
{"model":"beta", "ports":43},
{"model":"gamma", "ports":66},
{"model":"omega", "ports":6},
{"model":"omega", "ports":1}];

var result = [];

data.forEach(function(e) {
  if(!this[e.model]) {
    this[e.model] = e;
    result.push(this[e.model]);
  } else {
    this[e.model].include = (this[e.model].include || []).concat(e);
  }
}, {});

console.log(result)

Answer 2

您可以使用earlier version

var obj =[{"model":"alpha", "ports":4},
{"model":"beta", "ports":4},
{"model":"beta", "ports":1},
{"model":"beta", "ports":43},
{"model":"gamma", "ports":66},
{"model":"omega", "ports":6},
{"model":"omega", "ports":1}];

var res = obj.reduce(function(obj,currentValue){
  if (obj.length && obj[obj.length-1].model == currentValue.model){
  obj[obj.length-1].include=obj[obj.length-1].include || [];
  obj[obj.length-1].include.push(currentValue);
  }else{
    obj.push(currentValue)
  }
  return obj;
},[]);
console.log(res);

Answer 3

function processData(data) {
  return data.reduce(function (result, item) {
    var first = result.find(function (i) {
      return i.model === item.model;
    });
    if (!first) {
      item.include = [];
      result.push(item);
    } else {
      first.include.push(item);
    }
    return result;
  }, []);
}

var data = [{"model":"alpha", "ports":4},
  {"model":"beta", "ports":4},
  {"model":"beta", "ports":1},
  {"model":"beta", "ports":43},
  {"model":"gamma", "ports":66},
  {"model":"omega", "ports":6},
  {"model":"omega", "ports":1}];

console.log(processData(data));

通过特定规则使用JavaScript重构JSON

3 个答案: