Wherefore art thou

返回collection内对象包含source对象内所有属性，并且值相等

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

  collection.forEach((cur) => {
    var has = true;
    Object.keys(source).forEach((c) => {
      if (source[c] !== cur[c]) {
        has = false;
      }
    });
    if (has === true) {
      arr.push(cur);
    }
  });
  // Only change code above this line
  return arr;
}

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