Combining 2 jsons objects

Question

I've 2 json object that I would like to combine. I tried using concat and merge function, but the result is not what I want. Any help would be appreciated.

var jason1 = 
{
  "book1": {
    "price": 10,
    "weight": 30
  },
  "book2": {
    "price": 40,
    "weight": 60
  }
};

and this is the other object

var jason2 =
{
  "book3": {
    "price": 70,
    "weight": 100
  },
  "book4": {
    "price": 110,
    "weight": 130
  }
};

This is what I want:

var jasons =
{
  "book1": {
    "price": 10,
    "weight": 30
  },
  "book2": {
    "price": 40,
    "weight": 60
  }
  "book3": {
    "price": 70,
    "weight": 100
  },
  "book4": {
    "price": 110,
    "weight": 130
  }
};

Those aren't JSON objects, they're just objects. JSON is a way to represent an object as a string (e.g. for transmission over the network). — Barmar
– Barmar, Commented Oct 26, 2012 at 23:08
possible duplicate of How can I merge properties of two JavaScript objects dynamically? — Jon Clements
– Jon Clements, Commented Oct 27, 2012 at 10:23

J. K. · Accepted Answer · 2012-10-26 22:30:06Z

3

See the source of the Object.extend method from the Prototype.js framework:

https://github.com/sstephenson/prototype/blob/master/src/prototype/lang/object.js#L88

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

The usage is then…

extend(jason1, jason2);

The object jason1 now contains exactly what you want.

edited Oct 26, 2012 at 22:30

answered Oct 26, 2012 at 22:20

J. K.

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3 Comments

prodigitalson Over a year ago

This will certainly work but i dont think its worth adding a library just for this when it can be achieved fairly easily without.

J. K. Over a year ago

I didn't suggest to use the library, just to look at its source (the implementation of the Object.extend method).

prodigitalson Over a year ago

Ahh i saw prototype and thought you were suggesting he add the library... my bad.

prodigitalson · Accepted Answer · 2012-10-26 22:22:34Z

0

You jsut need to manually iterate over them:

var both = [json1, json2],
    jasons = {};


for (var i=0; i < both.length; i++) {
  for (var k in both[i]) {
    if(both[i].hasOwnProperty(k)) {
       jasons[k] = both[i][k];
    }
  }
}

Heres a working fiddle. You might want to think about what happens if there are duplicate keys though - for example what if book3 exists in both json objects. With the code i provided the value in the second one always wins.

answered Oct 26, 2012 at 22:22

prodigitalson

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Comments

pete · Accepted Answer · 2012-10-26 22:24:25Z

0

Here's one way, although I'm sure there are more elegant solutions.

var jason1 = {
    "book1": {
        "price": 10,
        "weight": 30
    },
    "book2": {
        "price": 40,
        "weight": 60
    }
};
var jason2 = {
    "book3": {
        "price": 70,
        "weight": 100
    },
    "book4": {
        "price": 110,
        "weight": 130
    }
};
var jasons = {};
var key;
for (key in jason1) {
    if (jason1.hasOwnProperty(key) && !(jasons.hasOwnProperty(key))) {
        jasons[key] = jason1[key];
    }
}
for (key in jason2) {
    if (jason2.hasOwnProperty(key) && !(jasons.hasOwnProperty(key))) {
        jasons[key] = jason2[key];
    }
}
console.log(jasons);

answered Oct 26, 2012 at 22:24

pete

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