javascript |对象分组 [英] javascript | Object grouping

问题描述

我有一个对象。它看起来如下：

I have an object. It looks like below:

[
  {
    "name":"Display",
    "group":"Technical detals",
    "id":"60",
    "value":"4"
  },
  {
    "name":"Manufacturer",
    "group":"Manufacturer",
    "id":"58",
    "value":"Apple"
  },
  {
    "name":"OS",
    "group":"Technical detals",
    "id":"37",
    "value":"Apple iOS"
  }
]

我想按组字段对这些数据进行分组并得到这个对象：

I would like to group this data by group field and get this object:

var obj = {
    0 = [
    {
       'group'   = 'Technical detals',
       'name'    = 'Display',
       'id'      = '60',
       'value'   = '4'
    },
    {
       'group'   = 'Technical detals',
       'name'    = 'OS',
       'id'      = '37',
       'value'   = 'Apple iOS'
    }],
    1   = [
    {
       'group'   = 'Manufacturer',
       'name'    = 'Manufacturer',
       'id'      = '58',
       'value'   = 'Apple'
    }]
}

如何对第一个对象进行分组？

How can I group my first object?

推荐答案

尝试这样的事情：

function groupBy(collection, property) {
    var i = 0, val, index,
        values = [], result = [];
    for (; i < collection.length; i++) {
        val = collection[i][property];
        index = values.indexOf(val);
        if (index > -1)
            result[index].push(collection[i]);
        else {
            values.push(val);
            result.push([collection[i]]);
        }
    }
    return result;
}

var obj = groupBy(list, "group");

请记住 Array.prototype.indexOf 在IE8及更早版本中未定义，但有常见的polyfill。

Keep in mind that Array.prototype.indexOf isn't defined in IE8 and older, but there are common polyfills for that.

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