如何在javascript中从对象数组中获取唯一的对象

我有一系列对象，如下图所示。有没有一种方法可以让我拥有一个包含唯一对象的数组id？我们可以在下面看到id索引 [0] 和索引 [2] 相同。

Is there a way that I can get an array containing objects with unique id and the first object from the last index is added to the unique array rather than the first object. In this case, Object at index[2] should be added instead of object at index[0]:

要获取适合您的特定情况的“唯一”对象数组（具有列表中的最后一个索引），请使用以下方法（Array.forEach, Array.map and Object.keys功能）：

// exemplary array of objects (id 'WAew111' occurs twice)
var arr = [{id: 'WAew111', text: "first"}, {id: 'WAew222', text: "b"}, {id: 'WAew111', text: "last"}, {id: 'WAew33', text: "c"}],
    obj = {}, new_arr = [];

// in the end the last unique object will be considered
arr.forEach(function(v){
    obj[v['id']] = v;
});
new_arr = Object.keys(obj).map(function(id) { return obj[id]; });

console.log(JSON.stringify(new_arr, 0, 4));

输出：

[
    {
        "id": "WAew111",
        "text": "last"
    },
    {
        "id": "WAew222",
        "text": "b"
    },
    {
        "id": "WAew33",
        "text": "c"
    }
]