Checking for equalities between objects

Question

Well, I need to check the content of 2 objects, I need to know if they are the same or not in the main fields.

My idea is to check by inserting some data in the localStorage if that data already exists, if it exists I should replace the existing object in the localStorage array, if not I need to create.

Example:

Object1 {TXT_NOMEX_PESSO: "Renan Rodrigues Moraes", COD_IDENT_PESSO: "9999160307115906859", FLG_IDENT_PESSO: "L", FLG_STATU_PESSO: "A", FLG_STATU_PARTC: "A"…}

Object2 {TXT_NOMEX_PESSO: "Lidiane Morais", COD_IDENT_PESSO: "9999160307134108952", FLG_IDENT_PESSO: "L", FLG_STATU_PESSO: "A", FLG_STATU_PARTC: "A"…}

Object3 {TXT_NOMEX_PESSO: "Renan Rodrigues", COD_IDENT_PESSO: "9999160307115906859", FLG_IDENT_PESSO: "L", FLG_STATU_PESSO: "A", FLG_STATU_PARTC: "A"…}

Should I enter the Object1 and right after the Object2 it would insert normal because there would be no why, in case I inserted the Object3he should replace the Object1 for Object3.

I need to do this as simply as possible, if there is one. The method I know to do this, is to go through every tuple of chave : valor and check whether it is the same.

I forgot to report something very important, as this is all for localStorage I need to know if it exists or not, I mean, I’m not always sure it will have 2 identical objects.

Answer 1

The easiest way is to transform each of the objects into strings and compare them:

JSON.stringify(obj1) === JSON.stringify(obj2);

Source: https://stackoverflow.com/questions/13142968/deep-comparison-of-objects-arrays

EDIT: how the problem involves LocalStorage, I suggest the following solution:

function saoIguais(nomeObj1, nomeObj2) {
    var obj1 = localStorage.getItem(nomeObj1)
    var obj2 = localStorage.getItem(nomeObj2)
    return obj1 !== null && obj2 !== null && JSON.stringify(obj1) === JSON.stringify(obj2)
}

Answer 2

You can iterate all fields of the first object and check if the value of these fields matches at the same value as the field in the second object.

function compareObjetos(objA, objB) {
    if (objA == null || objB == null) {
        // Se um dos objetos é nulo então são objetos diferentes. 
        // Mesmo por que null nem mesmo é um objeto...
        return false;
    }

    for (prop in objA) {
        if(!(objB[prop] === objA[prop])) {
            // Os objetos são diferentes.
            return false;
        }
    }

    // Os objetos são equivalentes.
    return true;
}