whatIsInAName.js

function whatIsInAName(collection, source) {
    // What's in a name?
    var arr = [];
    // Only change code below this line
    for (let collObj in collection) {
        console.log(collection[collObj]);
    }//can access this way

    collection.forEach(collObj => {//or this way
        console.log(collObj);
        let flag = true;
        let sourceArray = Object.entries(source);

        sourceArray.forEach(keyValue => {
            if (collObj[keyValue[0]] !== keyValue[1]) {
                //keyValue[0]] gets the value based on the array keyValue[0] which is the name.
                //keyValue[1] is the second element gives the value of the key
                flag = false;
            }
        })
        if (flag) {
            arr.push(collObj);
        }
    })

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

whatIsInAName([{ first: "Romeo", last: "Montague" }, { first: "Mercutio", last: null }, { first: "Tybalt", last: "Capulet" }], { last: "Capulet" });
  //15 minutes