JavaScript 按 id 合并对象 [英] JavaScript merging objects by id

问题描述

在 Javascript 中合并两个数组的正确方法是什么?

What's the correct way to merge two arrays in Javascript?

我有两个数组(例如):

I've got two arrays (for example):

var a1 = [{ id : 1, name : "test"}, { id : 2, name : "test2"}]
var a2 = [{ id : 1, count : "1"}, {id : 2, count : "2"}]

我希望能够得到类似的结果:

I want to be able to end up with something like:

var a3 = [{ id : 1, name : "test", count : "1"}, 
          { id : 2, name : "test2", count : "2"}]

根据id"字段连接两个数组，并简单地添加额外数据.

Where the two arrays are being joined based on the 'id' field and extra data is simply being added.

我尝试使用 _.union 来执行此操作，但它只是将第二个数组中的值覆盖到第一个数组中

I tried to use _.union to do this, but it simply overwrites the values from the second array into the first one

推荐答案

这应该可以解决问题:

var mergedList = _.map(a1, function(item){
    return _.extend(item, _.findWhere(a2, { id: item.id }));
});

这里假设a1中第二个对象的id应该是2而不是2"

This assumes that the id of the second object in a1 should be 2 rather than "2"

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