How iterate in one loop for compare the two objects in javascript

Question

I have two objects and I want to compare them from each other, like I need to check and value parallelly, but for this I need to execute only one for loop but I'm not able to make it.
Below is my code:

function traverseObject(object1, object2) {
  var key1;
  var key2;
  for (key1 in object1) {

    for (key2 in object2) {
      console.log('Key1 is -' + key1);
      //console.log('Key2 is -'+key2);
      if (object1.hasOwnProperty(key1) || object2.hasOwnProperty(key2)) {
        console.log('Value1 ' + object1[key1]);
        console.log('Value2 ' + object2[key2]);
        if ((object1[key1] !== null && typeof object1[key1] === 'object') || (object2[key2] !== null && typeof object2[key2] === 'object')) {
          process(object1[key1], object2[key2]);
        }
      }
    }
  }
}

Bu using this it's running first time for outer loop then it read all inner loop values then it read the second value of the outer loop and then again it read all values of the inner loop.
What i want is, this run at same time so that i can compare their values.

Can you elaborate on how you want to compare their values, do you want to check if object 1 has certain values of object 2? — Luïs
– Luïs, Commented Dec 20, 2019 at 7:43
yes i want to compare object on has same value and key as same in object2. — Upkar Singh
– Upkar Singh, Commented Dec 20, 2019 at 7:45
if you want to check if both objects are exactly same with same number of properties, you can do that with JSON.stringify(obj1) == JSON.stringify(obj2) — Akash Shrivastava
– Akash Shrivastava, Commented Dec 20, 2019 at 7:52
No, i need to dynamic traverse the object than compare each key and value. — Upkar Singh
– Upkar Singh, Commented Dec 20, 2019 at 8:10

Jonas Wilms · Accepted Answer · 2019-12-20 12:36:20Z

5

You could iterate over all keys that are in both objects:

  for(const key of [...new Set(Object.keys(object1).concat(Object.keys(object2))]) {
    if(key in object2) process(object1[key], object2[key]);
  }

edited Dec 20, 2019 at 12:36

answered Dec 20, 2019 at 7:45

Jonas Wilms

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6 Comments

ryeballar Over a year ago

You can use for...in statement, you don't need to get the array of keys.

Jonas Wilms Over a year ago

@ryeballar no, the behaviour would be different from the code the OP has shown, meaning that inherited properties would be iterated.

ryeballar Over a year ago

You're right, I forgot that OP is using object#hasOwnProperty to solve such issue.

ryeballar Over a year ago

If that's the case, then I think should also check if key is not an inherited property of object2.

Upkar Singh Over a year ago

@JonasWilms thank you for reply, your solution is only working when key is present in object1 but not in object2, but if a key is not present in object1 but present in object2, then this solution is not working, do you have any other way?

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