fruitMadness.js

function searchForColor(arr, arr2, color) {
  var result = arr.filter(function(v) {
    if(arr2.filter(function(a){ return a.fruit == v.fruit })[0]) {
    	return false;
      } else {
    	return v.color === color;
     }
  });
  return result;
}
var basketOfFruits = [
  {
    fruit: 'apple',
    color: 'red'
  },
  {
    fruit: 'strawberry',
    color: 'red'
  },
  {
    fruit: 'banana',
    color: 'yellow'
  },
  {
    fruit: 'pineapple',
    color: 'yellow'
  }
];

var eatenFruits = [
  {
    fruit: 'apple',
    color: 'red'
  }
];
//To get all red fruits not eaten
console.log(searchForColor(basketOfFruits, eatenFruits, 'red'));
//To only get the first not eaten
console.log(searchForColor(basketOfFruits, eatenFruits, 'red')[0]);