Question

我有一个像这样的对象数组。如果年份和DName是smae，我想合并这个。这是我的数组

var film = [{
    Year:2017
    DName:"Rohit"
    Released:"Golmal"
    id:0
},
{
    Year:2017
    DName:"Rohit"
    Upcoming:"Singham"
    id:1
},
{
    Year:2016
    DName:"Anil"
    Released:"xyz"
    id:2
},
{
    Year:2017
    DName:"David"
    Released:"Judva"
    id:3
},
{
    Year:2018
    DName:"Karan"
    InProgress:"Brahmastra"
    id:4
},
{
    Year:2017
    DName:"David"
    InProgress:"Something"
    id:5
}]

现在在这个json我希望如果year and DName相同，那么对象喊出合并。输出应该像

[{
    Year:2017
    DName:"Rohit"
    Released:"Golmal",
    Upcoming:"Singham"
    id:0
},
{
    Year:2016
    DName:"Anil"
    Released:"xyz"
    id:2
},
{
    Year:2017
    DName:"David"
    Released:"Judva",
    InProgress:"Something"
    id:3
},
{
    Year:2018
    DName:"Karan"
    InProgress:"Brahmastra"
    id:4
}]

我正在尝试合并对象，但我在循环中无法完成。

有没有人有这个或任何内置方法的脚本来实现这个？

我在这里尝试的是

ww function(destination,source) {
    for (var property in source)
        destination[property] = source[property];
    return destination;
}

现在在这种情况下，我可以传递两个对象，但对于一个数组，我不知道如何传递。

Answer 1

您可以使用哈希表来保持对具有相同Year和DName的对象的引用。然后更新所有属性并返回一个新数组。

var film = [{ Year: 2017, DName: "Rohit", Released: "Golmal", id: 0 }, { Year: 2017, DName: "Rohit", Upcoming: "Singham", id: 1 }, { Year: 2016, DName: "Anil", Released: "xyz", id: 2 }, { Year: 2017, DName: "David", Released: "Judva", id: 3 }, { Year: 2018, DName: "Karan", InProgress: "Brahmastra", id: 4 }, { Year: 2017, DName: "David", InProgress: "Something", id: 5 }],
    hash = {},
    result = [];

film.forEach(function (o) {
    function update(source, target) {
        Object.keys(source).forEach(function (k) { target[k] = source[k]; });
    }

    var key = ['Year', 'DName'].map(function (k) { return o[k] }).join('|');
    if (!(key in hash)) {
        hash[key] = {};
        result.push(hash[key]);
    }
    update(o, hash[key]);
});

console.log(result);

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ES6与Object.assign。

var film = [{ Year: 2017, DName: "Rohit", Released: "Golmal", id: 0 }, { Year: 2017, DName: "Rohit", Upcoming: "Singham", id: 1 }, { Year: 2016, DName: "Anil", Released: "xyz", id: 2 }, { Year: 2017, DName: "David", Released: "Judva", id: 3 }, { Year: 2018, DName: "Karan", InProgress: "Brahmastra", id: 4 }, { Year: 2017, DName: "David", InProgress: "Something", id: 5 }],
    hash = new Map,
    result = [];

film.forEach(function (o) {
    var key = ['Year', 'DName'].map(k => o[k]).join('|');
    if (!hash.has(key)) {
        hash.set(key, {});
        result.push(hash.get(key));
    }
    Object.assign(hash.get(key), o);
});

console.log(result);

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Answer 2

您可以使用 array.reduce ， array.find 和 Object.assign ：

var film = [{
    Year:2017,
    DName:"Rohit",
    Released:"Golmal",
    id:0
},
{
    Year:2017,
    DName:"Rohit",
    Upcoming:"Singham",
    id:1
},
{
    Year:2016,
    DName:"Anil",
    Released:"xyz",
    id:2
},
{
    Year:2017,
    DName:"David",
    Released:"Judva",
    id:3
},
{
    Year:2018,
    DName:"Karan",
    InProgress:"Brahmastra",
    id:4
},
{
    Year:2017,
    DName:"David",
    InProgress:"Something",
    id:5
}];

var film = film.reduce((m, o) => {
    var found = m.find(p => p.Year === o.Year && p.DName === o.DName);        
    if (found) {
        var foundId = found.id;  // Save id, it will be overwritten by Object.assign
        Object.assign(found, o);
        found.id = foundId;      // restore id
    } else {
        m.push(o);
    }
    return m;
}, []);

console.log(film);

如何合并数组中的两个对象

2 个答案: