减少for循环内的方法-JS

问题描述

我试图使用for循环遍历条目数组并使用reduce方法，但是reduce在第一个条目之后返回，从不进入第二个，第三个等条目以将结果推入数组v。

有什么想法吗？

export const groupEventData = eventData => {
    console.log(eventData)
    // returns[{
    //     "id": "141",//     "name": "00333",//     "no_transmission": true,//     "low_battery" :true,// },// {
    //     "id": "307",//     "name": "01163",//     "low_data_rate": true,// }
    // ]

    // Now let's group similar event types
    let v = [];
    let types = ["no_transmission","low_data_rate","low_battery"]; 
    for (let x = 0; x <= types.length; x++) {
        let data = eventData.reduce((acc,i) => {
            if (!acc[i[types[x]]] && typeof i[types[x]] !== 'undefined') {
                acc[i[types[x]]] = [i]
            }
            else if (Array.isArray(acc[i[types[x]]])) {
                acc[i[types[x]]].push(i);
            }
            else if (typeof acc[i[types[x]]] === 'object') {
                acc[i[types[x]]] = [acc[i[types[x]]]]
                acc[i[types[x]]].push(i)
            }
            return acc;
        },{});
        // Doesn't add a property for the type if there are no data
        Object.keys(data).length && v.push({ [types[x]: data });
        return v;
    };

}

解决方法

您的for循环中有return v。尝试将其撞到紧靠其下方的大括号下方。现在，for循环仅迭代一次，然后返回一个值。

在下面为我工作：

const eventData = [
  {"id": "141","name": "00333","no_transmission": true,"low_battery": true},{"id": "307","name": "01163","low_data_rate": true}
]

const type = 'bc'

const types = ["no_transmission","low_data_rate","low_battery"]

const groupEventData = (eventData,type) => {
  let v = [];
  for (let x = 0; x <= types.length; x++) {
    let data = eventData.reduce((acc,i) => {
      if (!acc[i[types[x]]] && typeof i[types[x]] !== 'undefined') {
        acc[i[types[x]]] = [i]
      }
      else if (Array.isArray(acc[i[types[x]]])) {
        acc[i[types[x]]].push(i);
      }
      else if (typeof acc[i[types[x]]] === 'object') {
        acc[i[types[x]]] = [acc[i[types[x]]]]
        acc[i[types[x]]].push(i)
      }
      return acc;
    },{});
    Object.keys(data).length && v.push({ [`${types[x]}_${type}`]: data });
  };
  return v;
}

console.log('groupEventData',groupEventData(eventData,type))