Underscore.js：使用对象中的键创建对象列表中的地图 [英] Underscore.js: create a map out of list of objects using a key found in the object

问题描述

我正在使用优秀的 Underscore.js 库。我有一个特定的任务，我可以使用JavaScript或jQuery做得很好但是想知道在Underscore中是否有某种抽象可以让我错过了。

I am using the excellent Underscore.js library. I have a specific task which I can do fine using JavaScript or jQuery but was wondering if there was some sort of abstraction avaialable in Underscore that I was missing out on.

基本上我有一个像这样的对象 -

Essentially I have an object like so -

var some_object_array = [{id: "a", val: 55}, {id: "b", val: 1}, {id: "c", val: 45}];

我想将其转换为 -

I want to convert this into -

var some_map = {"a": {id: "a", val: 55}, "b": {id: "b", val: 1}, "c": {id: "c", val: 45}};

我知道我可以使用 _。groupBy（some_object_array，id ）。但是这会返回一个这样的地图 -

I know that I can use _.groupBy(some_object_array, "id"). But this returns a map like so -

var some_grouped_map = {"a": [{id: "a", val: 55}], "b": [{id: "b", val: 1}], "c": [{id: "c", val: 45}]};

请注意，这样做会做广告宣传。但是我希望得到 some_map ，而不是自己迭代对象。

Note that this does what it is advertised to do. But I was hoping to get some_map without iterating over the objects myself.

任何帮助表示赞赏。

推荐答案

FWIW因为undercore.js你现在可以使用 _.object（）

FWIW since underscore.js you can now use _.object()

var some_map = _.object(_.map(some_object_array, function(item) {
   return [item.id, item]
}));

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