function whatIsInAName(collection, source) {
  // What's in a name?
  var arr = [];
  // Only change code below this line

  console.log("----Start------");
  console.log("collection", collection, "source", source);

//whatIsInAName([{ "a": 1, "b": 2 }, { "a": 1 }, { "a": 1, "b": 2, "c": 2 }], { "a": 1, "b": 2 }) should return [{ "a": 1, "b": 2 }, { "a": 1, "b": 2, "c": 2 }].

  var filteredCollection = collection.filter( function (objCollection) {
    console.log("--- ARRAY NEW ---");
    console.log("objCollection", objCollection);
    return Object.entries(source).every(function(elementSource){
      var result1 = false;
      console.log("----NEW element source TEST---");
      console.log("elementSource", elementSource);
      // [first, Romeo], [last, Montague]
      // elementCollection [first, Romeo]
      Object.entries(objCollection).forEach(function(elementCollection) {
        console.log("----NEW collection TEST---");
        console.log("elementCollection", elementCollection);
        console.log("elementCollection[0] === elementSource[0]", elementCollection[0] === elementSource[0]);
            console.log("elementCollection[1] === elementSource[1]", elementCollection[1] === elementSource[1]);
        result1 |=  elementCollection[0] === elementSource[0] && elementCollection[1] === elementSource[1];
        });
      console.log("result", result1);
    //  return result1;
      return result1;
    });
  });
  console.log("------Result----");
  console.log(filteredCollection);

  // Only change code above this line
  return filteredCollection;
}

whatIsInAName([{ first: "Romeo", last: "Montague" }, { first: "Mercutio", last: null }, { first: "Tybalt", last: "Capulet" }], { last: "Capulet" });