JavaScript的合并通过ID对象 [英] JavaScript merging objects by id

问题描述

什么是在Javascript合并两个数组的正确方法？

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

我有两个阵列（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"}]

我希望能够与像落得：

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"}]

当两个阵列被基于的id字段接合并且被简单地添加额外的数据。

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

我试图用 _。工会来做到这一点，但它只是覆盖从第二个数组中的值入第1

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

这应该做的伎俩：

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

这个假定a1中的第二对象的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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