加入嵌套数组

Question

我从 Q.all() 得到一个结果，是这样的 -

promise = [Arr1,Arr2,Arr3....]

每个 Arr 可以是 null 或普通 JS 对象数组。

我想将所有这些数组合并为一个大数组；

我可以循环使用数组 concat 方法来加入它们。

有没有其他内置在 JS 中的优雅解决方案？

这是示例数组 -

    [
      {
        "endDate": "2015-06-11 14:52:00",
        "quantity": 75,
      },
      {
        "endDate": "2015-06-11 14:42:00",
        "quantity": 78,
      },
      {
        "endDate": "2015-06-01 14:43:00",
        "quantity": 69,
      },
      {
        "endDate": "2015-05-14 13:38:00",
        "quantity": 85,
      }
    ]

I have these libraries available as well lodash, angular

Answer 1

我相信这将是 flattenDeep (to do the flattening) and without 的组合（删除 nulls — 至少，我认为你想删除 nulls；如果不是，请取 without出):

var result = _.without(_.flattenDeep(yourArray), null);

实例：

// NOTE: You said you had an array with arrays in it, so I've taken
// the one array you gave and used it as two entries in the array
// below (with some minor mods). Note also the nulls.
var yourArrays = [
    [
        {
            "endDate": "2015-06-11 14:52:00",
            "quantity": 75
        },
        {
            "endDate": "2015-06-11 14:42:00",
            "quantity": 78
        },
        {
            "endDate": "2015-06-01 14:43:00",
            "quantity": 69
        },
        {
            "endDate": "2015-05-14 13:38:00",
            "quantity": 85
        }
    ],
    null,
    null,
    [
        {
            "endDate": "2015-07-11 14:52:00",
            "quantity": 12
        },
        {
            "endDate": "2015-07-11 17:42:00",
            "quantity": 34
        },
        {
            "endDate": "2015-07-01 13:43:00",
            "quantity": 56
        },
        {
            "endDate": "2015-08-14 12:38:00",
            "quantity": 85
        }
    ]
];
var result = _.without(_.flattenDeep(yourArrays), null);
document.body.insertAdjacentHTML(
"beforeend",
"<pre>" + JSON.stringify(result, null, 2) + "</pre>"
);

<script src="https://cdn.rawgit.com/lodash/lodash/3.0.1/lodash.min.js"></script>

Answer 2

你可以简单地使用.map功能。

var promise = [[0,1],[2,3],[],[6,7]]
var combineArr = promise.map(function(value, index, array) {
    return array[index];
  });
alert(combineArr);

DEMO

加入嵌套数组

Join nested array

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