JavaScript How can I merge javascript two objects but only update properties that change merge javascript objects in array with same key,merge javascript

Since you're already using Underscore, you could use Lodash instead, which is a superset of Underscore, and use its #merge function.

See this question about Differences between Lodash and underscore

// My original kitchen
var kitchen = {
  fridge: {
    beer: true,
    celery: false
  },
  cabinets: {
    candy: true
  }
};


// updates I would like to make to my kitchen
var changeKitchen = {
  fridge: {
    celery: true
  }
};


var updatedKitchen = _.merge(kitchen, changeKitchen);

document.write(JSON.stringify(updatedKitchen));
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/3.10.1/lodash.js"></script>
Answer:1

Use _.extend on the nested objects instead:

function update(obj1, obj2) {
  for (var p in obj2) {
    if (obj1[p]) {
        _.extend(obj1[p], obj2[p]);
    } else {
      obj1[p] = obj2[p];
    }
  }
}

update(kitchen, changeKitchen);

DEMO

Answer:2

Here is a solution in plain Javascript:

var kitchen = { fridge: { beer: true, celery: false }, cabinets: { candy: true } },
    changeKitchen = { fridge: { celery: true } };

function update(source, target) {
    Object.keys(target).forEach(function (k) {
        if (typeof target[k] === 'object') {
            source[k] = source[k] || {};
            update(source[k], target[k]);
        } else {
            source[k] = target[k];
        }
    });
}

update(kitchen, changeKitchen);
document.write('<pre>' + JSON.stringify(kitchen, 0, 4) + '</pre>');
Answer:3

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