Question

我正在使用ExpressJS在我的应用程序今日公路旅行中创建JSON，我将在指标 0 - 0 中创建新阵列JSON >列出停车位。

如何在指标 0 中创建新数组为 0 ？

示例JSON：

{ "data": [
    { "speed": "0" },
    { "speed": "10" },
    { "speed": "2" },
    { "speed": "5" },
    { "speed": "4" },
    { "speed": "9" },
    { "speed": "0" },
    { "speed": "2" },
    { "speed": "4" },
    { "speed": "33" },
    { "speed": "0" },
]};

为：

{ "data": [{
    "1": [
        { "speed": "10" },
        { "speed": "2" },
        { "speed": "5" },
        { "speed": "4" },
        { "speed": "9" },
    ],
    "2": [
        { "speed": "2" },
        { "speed": "4" },
        { "speed": "33" },
    ]
}]};

由于

Answer 1

你可以这样做。简单的逻辑：

var arrayData = { "data": [
    { "speed": "0" },
    { "speed": "10" },
    { "speed": "2" },
    { "speed": "5" },
    { "speed": "4" },
    { "speed": "9" },
    { "speed": "0" },
    { "speed": "2" },
    { "speed": "4" },
    { "speed": "33" },
    { "speed": "0" },
]}; 
var key = 0;
var innerArray=[{}];
arrayData.data.forEach((obj, index)=>{
   if(obj.speed === "0"){
     //check that this is not last object 
     if(index+1 !== arrayData.data.length){
      key++;
      innerArray[0][key]=[];
     }
   } else {
      innerArray[0][key].push(obj); 
   }
});
var resultArray  = { "data": innerArray}; 
console.log(resultArray)

Answer 2

 const result = [];
 input.reduce((trip, {speed}) => speed === "0" && trip.length ? (result.push(trip), []) : (trip.push({speed}), trip), []);

只要发生0，就开始新的旅行，如果不是只是将数据添加到旅行中。

如果您更喜欢命令式而非函数式编程：

const result = [];
var trip = [];
for(const {speed} of input){
   if(speed === "0" && trip.length){
     result.push(trip);
     trip = [];
   }else{
     trip.push({speed});
   }
}

在指标中创建数组JSON

2 个答案: