shallow compare 2 javascript JS objects

shallow-compare-2-objects.js

const shallowCompareFN = (obj1, obj2) =>
    Object.keys(obj1).length === Object.keys(obj2).length &&
    Object.keys(obj1).every(key => 
        obj2.hasOwnProperty(key) && obj1[key] === obj2[key]
);

let obj1 = {
    prop1 : 'abc',
    prop2 : '123'
}

let obj2 = {
    prop1 : 'abc',
    prop2 : '123'
}
     
/*
  obj1 == obj2                <-- false;
  obj1 === obj2               <-- false
  shallowCompareFN(obj1,obj2) <-- true
*/
 //Now if you set
 let obj3 = obj2;
 obj3.prop1 = 'changed';
 
 /*
 obj3 == obj2                     <-- true; obviously, same object.
 BUT shallowCompareFN(obj1,obj2)  <-- false, because changing obj3 affects obj2; 
  unless the assignment was destructured i.e. let obj3 = {...obj2} 
*/