16.Bonfire: Where art thou

Where art thou

function where(collection, source) {
  var arr = [];
  var findKeys = Object.keys(source);
  
  for (var i = 0; i < collection.length; i++) {
      var currentObj = collection[i];
      for (var j = 0; j < findKeys.length; j++) {
          var key = findKeys[j];
          if (currentObj.hasOwnProperty(key) && currentObj[key] === source[key]) {
              arr.push(currentObj);
          }
      }
  }
  return arr;
}

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