JavaScript get elements from an object array that are not in another

Question

I\'m new in JavaScript programming and I have two object arrays that have the following structure:

myFirstObjArray = [{foo: 1, bar: 1}, {foo: 3, bar: 3}, {fo         


        

Answer 1

ES5 without using fat arrow,

var myFirstObjArray = [{foo: 1, bar: 1}, {foo: 3, bar: 3}, {foo: 4, bar: 5}],
    mySecondObjArray = [{foo: 2}, {foo: 4}, {foo: 5}],
    
    firstArray  = myFirstObjArray.filter(function(o) { return !mySecondObjArray.some(function(i) { return i.foo === o.foo})});
     
    secondArray  = mySecondObjArray.filter(function(o) { return !myFirstObjArray.some(function(i) { return i.foo === o.foo})});
    
    console.log(firstArray)
    console.log(secondArray)