map.js

const eqArrays = function(arr1, arr2) {
  let outcome;
  if (arr1.length === arr2.length) {
    let arrayLength = arr2.length;
    for (let i = 0; i < arrayLength; i++) {
      if (arr1[i] === arr2[i]) {
        outcome = true;
      } else {
        outcome = false;
      }
    }
  } else {
    outcome = false;
  }
  return outcome;
};

const assertArraysEqual = function(outcome) {
  if (outcome) {
    console.log(`✅ Assertion Passed: eqArrays function returns ${outcome}`);
  } else {
    console.log(`❌ Assertion Failed: eqArrays function returns ${outcome}`);
  }
};

const words = ["ground", "control", "to", "major", "tom"];

const map = function(array, callback) {
  const results = [];
  
  for (let item of array) {
    results.push(callback(item));
  }

  return results;
}

const results1 = map(words, word => word[0]);
// console.log(results1);