Exploring Updates in Two Objects Using a Loop in JavaScript

Two different Objects are structured as follows:

Obj1:

{
 0: {name:"", id: 0},
 1: {"age": "", id:0},
 2: {name:"", id: 1},
 3: {"age": "", id:1},
}

After triggering a property, the structure changes to:

Obj2:

{
 0: {name:"", id: 0},
 1: {"age": "", id:0},
 2: {name:"john", id: 1},
 3: {"age": "", id:1},
}

A function is needed to compare both objects and return any changes. In this case, the output should be [{name:"john", id:1}]

Existing solutions focus on looping through flat objects only.

An attempt was made to create a comparison function but got stuck trying to loop through obj2 simultaneously.

function objDiff(object1, object2){
   for(var set in object1) {
      for(property in set) {
        // Comparison logic
      }
   } 
}

The ids remain constant, only the first property changes.

Any advice on how to approach looping through both objects concurrently would be appreciated

Answer №1

If you're wondering about the efficiency of this approach for your objects, one way to go about it is by looping through the values of the second object, converting them into strings, and then filtering out any elements that do not exist in the stringified version of the first object:

let obj1 = {
 0: {name:"", id: 0},
 1: {"age": "", id:0},
 2: {name:"", id: 1},
 3: {"age": "", id:1},
}

let obj2 = {
 0: {name:"", id: 0},
 1: {"age": "", id:0},
 2: {name:"john", id: 1},
 3: {"age": "", id:1},
}
let obj1String = JSON.stringify(obj1);
let result = Object.values(obj2).filter((e) => !obj1String.includes(JSON.stringify(e)))
console.log(result);

Answer №2

It's worth considering refactoring your code to establish a more effective data structure for easier manipulation. While this suggestion may not be the most popular choice and could pose challenges, it has the potential to benefit you in the long term.

Rather than structuring it like this:

obj1 = {
 0: {name:"", id: 0},
 1: {"age": "", id:0},
 2: {name:"", id: 1},
 3: {"age": "", id:1}
};

You should transition to this format:

obj1 = [
 {name:"", "age": "", id: 0},
 {name:"", "age": "", id: 1},
 ...
];

This revision transforms the data into an array of objects, each representing a single entity or item. This simplifies updating information based on ID when new data is added.

The current setup with two distinct objects in the same array can lead to confusion about which object is being operated upon within each array element. Additionally, converting keys into an array for looping purposes is less efficient with the current object pretending to be an array.

let obj1 = {
 0: {name:"", id: 0},
 1: {"age": "", id:0},
 2: {name:"", id: 1},
 3: {"age": "", id:1}
};

let keys = Object.keys(obj1);

for (let i = 0; i < keys.length; i++){
  console.log(obj1[i]);
}

Opting for an array eliminates the need to extract keys from the object before processing. In scenarios where speed matters, such as in a game or financial app, this small change can yield significant performance improvements. Array-based structures are simpler, faster, and more scalable.

Keeping multiple objects within a single array requires conditional checks for each element, leading to unnecessary time consumption.

let obj1 = [
 {name:"", id: 0},
 {"age": "", id:0},
 {name:"", id: 1},
 {"age": "", id:1}
];

for (let i = 0; i < obj1.length; i++){
  console.log(obj1[i]);
}

Furthermore, ensuring consistent property declarations (either all quoted or none) avoids potential compatibility issues that might arise unexpectedly.

In conclusion, restructuring the data into a unified array enhances code clarity, efficiency, and maintainability. It streamlines future expansions and modifications while mitigating complications associated with mixed objects within an array.

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