Merging two objects in nodejs

Question

I have following two objects

First:

var a = [{a:1},
 {b:2},
 {c:3}
]

Second:

var b = [{a:1},
 {b:2},
 {c:3}
]

I am trying to merge the objects using following function which I wrote:

var json_concat = async (o1, o2) => {
    return new Promise((resolve, reject) => {
        try {
            for (var key in o2) {
                o1[key] = o2[key];
            }
            resolve(o1);
        } catch (e) {
            reject(e);
        }
    });
}

I am not getting the concatenated object by this. The required result is:

var c = [
{a:1},
{b:2},
{c:3},
{a:1},
{b:2},
{c:3}
]

Please help. Thanks in advance

Does this answer your question? how can I concatenate two arrays in javascript? — Heretic Monkey
– Heretic Monkey, Commented Oct 9, 2020 at 14:07

Derek Wang · Accepted Answer · 2020-10-09 14:03:27Z

2

You don't need to make a specific concat function to get that result. Using Array.concat, you can get the result easily.

var a = [
  {a:1},
  {b:2},
  {c:3}
];

var b = [
  {a:1},
  {b:2},
  {c:3}
];

const result = a.concat(b);
console.log(result);

answered Oct 9, 2020 at 14:03

Derek Wang

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1 Comment

Heretic Monkey Over a year ago

This is a common question and at your rep you should be familiar with what kinds of questions will have been asked before.

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