countOnly.js

const assertEqual = function(actual, expected) {
  if (actual === expected) {
    console.log(`✅ Assertion Passed: ${actual} === ${expected}`);
  } else {
    console.log(`❌ Assertion Failed: ${actual} !== ${expected}`);
  }
};

const countOnly = function(allItems, itemsToCount) {
  let results = {};
  for (let item of allItems) {
    //console.log(item)
    if (itemsToCount[item]) {
      if (results[item]) {
        results[item] += 1;
      } else {
        results[item] = 1;
      }
    }
  }
  return results;
};

const firstNames = [
  "Karl",
  "Salima",
  "Agouhanna",
  "Fang",
  "Kavith",
  "Jason",
  "Salima",
  "Fang",
  "Joe"
];

// const result1 = countOnly(firstNames, {"Jason" : true, "Karima": true, "Fang": true, "Agouhanna": false});
// console.log(result1);

// assertEqual(result1["Jason"], 1);
// assertEqual(result1["Karima"], undefined);
// assertEqual(result1["Fang"], 2);
// assertEqual(result1["Agouhanna", undefined]);

module.exports = countOnly;