@suncraft/lotide/countOnly.js

Lighthouse labs lodash remake by students.

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

// allItems: an array of strings that we need to look through
// itemsToCount: an object specifying what to count
const countOnly = function(allItems, itemsToCount) {
  const results = {};

  for (const item of allItems) {
    // console.log(item);
    // inside the loop, 
    // increment the counter for each item:
    //   set a property with that string key to:
    //     the value that was already there (or zero if nothing there) with 1 added to it.
    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 });

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

module.exports = countOnly;