lotide/map.js at master · SamMaisha/lotide · GitHub

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// map FUNCTION IMPLEMENTATION; The map function will take in two arguments - an array to map, and a callback funtion - it will return a new array based on the results of the callback function

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

module.exports = map;

// // TESTING

// // eqArrays FUNCTION

// const eqArrays = function(array1, array2) {
//   let assertion = true;
//   if (array1.length !== array2.length) {
//     assertion = false;
//     return assertion;
//   }
//   for (let i = 0; i < array1.length; i++) {
//     if (array1[i] !== array2[i]) {
//       assertion = false;
//       return assertion;
//     }
//   }
//   return assertion;
// };

// // assertArraysEqual FUNCTION

// const assertArraysEqual = function(actualArray, expectedArray) {
//   let arraysEqual = eqArrays(actualArray, expectedArray);
//   if (arraysEqual) {
//     console.log(`🟢🟢🟢 Assertion Passed: ${actualArray} === ${expectedArray}`);
//   } else {
//     console.log(`🔴🔴🔴 Assertion Failed: ${actualArray} !== ${expectedArray}`);
//   }
// };

// // TEST CASES

// const words = ["ground", "control", "to", "major", "tom"];
// const results1 = map(words, word => word[0]);
// assertArraysEqual(results1, ["g", "c", "t", "m", "t"]);

// const pies = ["apple", "custard", "coconut cream"];
// const results2 = map(pies, pie => pie + " pie");
// assertArraysEqual(results2, ["apple pie", "custard pie", "coconut cream pie"]);

// const numbers = [1, 2, 3, 4, 5, 6, 7];
// const results3 = map(numbers, x => x * 5);
// assertArraysEqual(results3, [5, 10, 15, 20, 25, 30, 35]);