两个数组到对象数组的对象

Question

我有这样的数据:

var data = {
  value1: ["a", "b", "c"],
  value2: [1, 2, 3]
}

我想将其转换为:

var newData = [
  {value1: "a", value2: 1},
  {value1: "b", value2: 2},
  {value1: "c", value2: 3}
]

我怎样才能通过javascript实现这一目标？

Answer 1

使用Array#map方法生成数组.

var data = {
  value1: ["a", "b", "c"],
  value2: [1, 2, 3]
};

// iterate over the first property
var res = data.value1.map(function(v, i) {
  // generate the array object element
  return {
    value1: v,
    value2: data.value2[i]
  }
});

console.log(res);

更新1:如果属性名称未知,那么您可以执行此类操作.

var data = {
  value1: ["a", "b", "c"],
  value2: [1, 2, 3]
};

// get all property names
var keys = Object.keys(data);

// iterate over the first property name array
var res = data[keys[0]].map(function(v, i) {
  // generate the object by iterating over the keys array
  return keys.reduce(function(obj, k) {
    // define the object property
    obj[k] = data[k][i];
    // return the objet reference
    return obj;
    // set initial value as empty object
  }, {});
});

console.log(res);

更新2:如果数组长度可能不同,那么您需要从集合中获取更大的数组.

var data = {
  value1: ["a", "b", "c", "d"],
  value2: [1, 2, 3],
  value3: [1, 2, 3, 5, 6, 7, 8]
};

// get all property names
var keys = Object.keys(data);

// iterate over the largest array
var res = data[
  // get the largest array holding key from the keys array  
  keys.reduce(function(k, k1) {
    return data[k1].length > data[k].length ? k1 : k;
  })
].map(function(v, i) {
  // generate the object by iterating over the keys array
  return keys.reduce(function(obj, k) {
    // check element exist in the array by comparing
    // the length and index
    if (data[k].length > i)
    // define the property if value exist in index
      obj[k] = data[k][i];
    // return the objet reference
    return obj;
    // set initial value as empty object
  }, {});
});

console.log(res);