@allenfuture/lotide/countOnly.js

Support [flatten] test

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) {
  const result = {};
  for (let item of allItems) {
    if (itemsToCount[item]) {
      if (result[item]) {
        result[item] += 1;
      } else {
        result[item] = 1;
      }
    }
  }
  return result;
};

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

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

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

module.exports = countOnly;