Mergining multi-dimensional objects in javascript

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Default Object

var default_obj = {
    "cloud": {
        "something_1": {
            "view": false,
            "create": false
        },
        "something_2": {
            "view": false,
            "create": false
        },
        "something_3": {
            "view": false,
            "create": false
        },
    }
}

Object to Merge

var merge_obj = {
    "cloud": {
        "something_1": {
            "view": true,
            "create": true
        },
        "something_2": {
            "view": false,
            "create": false
        }
    }
}

After Merge

var merge_obj = {
    "cloud": {
        "something_1": {
            "view": true,
            "create": true
        },
        "something_2": {
            "view": false,
            "create": false
        }
        "something_3": {
            "view": false,
            "create": false
        }
    }
}

I basically want the second object to overwrite everything in the default object, HOWEVER, if there is new pieces of information in the default object that isn't found in the second one, to include that.

Just by doing { ...default_obj, ...merge_obj } works for the first part of overwriting but it leaves out something_3

If anyone has any guidance I would be greatly appreciated.

EDIT: Just want to note that the objects will not always hold view, or create it could really be anything but it will never go any deeper in dimensions.

I don't know if there's a built-in for this, but I would have thought just looping through if not?

for(var x in merge_obj['cloud']) {
   default_obj['cloud'][ x ] = merge_obj['cloud'][x];
}

Haven't tested, but think that would work as it would overwrite if already there and insert if not.

JavaScript Deep Merge, If you're looking for a utility to help with deep merges, look no further than the tiny deepmerge utility! When you use the deepmerge utility, you can recursively merge any number of objects (including arrays) into one final object. It is very popular in JavaScript libraries to merge objects. It let users set options. First of all, let’s see our three objects below: var fruit = { name: 'Mango', test: 'Good' }; var property = { color: 'Yellow', test: 'Sweet', size: 'big' }; var price = { market: '40', wholesale: '25' }; Now, we want to merge these three objects.

You need recursion to iterate through the properties, this function can be created manually but I suggest to use any library or use an already tested code, this is because of the similitudes between Array and Object and some other conditions.

Here is a link to an example https://davidwalsh.name/javascript-deep-merge

Javascript Deep Merge (Merge multidimensional object), /* Deepmerge - Start */ function isMergeableObject(val) { var nonNullObject = val && typeof val === 'object' return nonNullObject. && Object. prototype. toString. call(val) !== '[object RegExp]' && Object. prototype. toString. call(val) !== '[object Date]' } After merging, the person and employee object have the contact property that reference to the same object. The Deep Merge. To recursively merge own and inherited enumerable string keyed properties of source objects to a target object, you can use the Lodash ._merge() method: _.merge (object, [sources]) In this tutorial, you have learned how to

Try this npm library: https://www.npmjs.com/package/deep-extend

Otherwise, you'll have to recurse into each child object to merge them.

How to merge properties of two JavaScript objects dynamically , It allows the privilege to obtain a list of parameters from an array. Javascript objects are key-value paired dictionaries. We can merge different objects into one  Here are 2 ways to combine your arrays and return a NEW array. I like using the Spread operator. But if you need older browser support, you should use Concat. Alternatively, you can also write the concat method, in this regard: As you can see, this way of writing it doesn't manipulate or change the existing array. Which one should I pick?

This function will do the merge between the two objects.

function merge(obj, src) {
     Object.keys(src).forEach(function(key) {          
       if (typeof src[key] === 'object') {
         if (typeof obj[key] === 'undefined') obj[key] = {};

         obj[key] = merge(obj[key], src[key]);
       } else {

         obj[key] = src[key];
       }
     });

  return obj;
}

merge(default_obj, merge_obj)

But there is available libraries like lodash that already do that. Example: _.merge(default_obj, merge_obj);

Flattening multidimensional Arrays in JavaScript, These are the three known ways to merge multidimensional array into a single array. Yes you are right. but if you just want to merge two arrays then you can use above mentioned one line simple solution. As question title says "Merge 2 arrays of objects". Simply use 'Array.prototype.push.apply(arr1,arr2); ' If you want to merge 2 arrays of objects in JavaScript.

2 Ways to Merge Arrays in JavaScript, Here are 2 ways to combine your arrays and return a NEW array. I like using the Spread operator. But if you need older browser support, you should use Concat. //  Note that concat does not modify the source array, so the merged array will remain empty after the call to concat. Better to say something like: merged = merged.concat.apply (merged, arrays); – Nate Jan 24 '13 at 21:12. var merged = [].concat.apply ( [], arrays); seems to work fine to get it on one line. edit: as Nikita's answer already shows

array_merge_recursive - Manual, So I wrote the below function, which merges two arrays, and returns the last, and age) and you needed to combine the data in a multi-dimensional array in  Multidimensional arrays are not directly provided in JavaScript. If we want to use anything which acts as a multidimensional array then we need to create a multidimensional array by using another one-dimensional array. So multidimensional arrays in JavaScript is known as arrays inside another array.

Array object JavaScript, The elements within a multi-dimensional array are accessed using more than In JavaScript, every object can behave like an associative array. If you want to concatenate the values with a separator other than comma, use the join method. The Object.assign() method copies all enumerable own properties from one or more source objects to a target object. It returns the target object. It returns the target object. The source for this interactive example is stored in a GitHub repository.

Comments
  • Please, post how the object should look like after the merge. When it find two keys with same name, what should output?
  • @CalvinNunes edited, sorry for the confusion
  • It should replace the objects that already exists? Example: something_1 have all values set to false, but the merge shows it as true. So it gets the values from the merge_obj right?
  • @CalvinNunes yup, however you'll see that something_3 is not in merge_obj so it needs to be added.
  • Bryan, did you see my answer (the last answer here) ?
  • This would assume that cloud is defined which isn't always the case. But I'll try and edit it to see if it works. Sometimes the simple answer is the easiest
  • Ah, I see. I certainly agree with the last point. I guess it depends on how dynamic the objects are. Possibly, as luis has suggested, some kind of recursive call would resolve this, but it could get messy quickly.