whowhat.js

function whereAreYou(collection, source) {
  // What's in a name?
  var arr = [];
  // Only change code below this line
  var sourceKeys = Object.keys(source);
  
  for (var i=0;i<collection.length;i++){
    for(var l=0;l<sourceKeys.length;l++){
      var prop = sourceKeys[l];
      if(collection[i].hasOwnProperty(sourceKeys[l]) && collection[i][prop] === source[prop]){
        arr.push(collection[i]);
      }
    }
  }
  
  //console.log(arr);
  // Only change code above this line
  return arr;
}

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