--description--

You might learn a lot about the filter method if you implement your own version of it. It is recommended you use a for loop or Array.prototype.forEach().

--instructions--

Write your own Array.prototype.myFilter(), which should behave exactly like Array.prototype.filter(). You should not use the built-in filter method. The Array instance can be accessed in the myFilter method using this.

--hints--

[23, 65, 98, 5, 13].myFilter(item => item % 2) should equal [23, 65, 5, 13].

const _test_s = [23, 65, 98, 5, 13];
const _callback = item => item % 2;
assert(JSON.stringify(_test_s.filter(_callback)) === JSON.stringify(_test_s.myFilter(_callback)));

["naomi", "quincy", "camperbot"].myFilter(element => element === "naomi") should return ["naomi"].

const _test_s = ["naomi", "quincy", "camperbot"];
const _callback = element => element === "naomi";
assert(JSON.stringify(_test_s.filter(_callback)) === JSON.stringify(_test_s.myFilter(_callback)));

[1, 1, 2, 5, 2].myFilter((element, index, array) => array.indexOf(element) === index) should return [1, 2, 5].

const _test_s = [1, 1, 2, 5, 2];
const _callback = (element, index, array) => array.indexOf(element) === index;
assert(JSON.stringify(_test_s.filter(_callback)) === JSON.stringify(_test_s.myFilter(_callback)));

Your code should not use the filter method.

assert(!__helpers.removeJSComments(code).match(/\.?[\s\S]*?filter/g));

--seed--

--seed-contents--

Array.prototype.myFilter = function(callback) {
  const newArray = [];
  // Only change code below this line

  // Only change code above this line
  return newArray;
};

--solutions--

Array.prototype.myFilter = function(callback) {
  const newArray = [];
  for (let i = 0; i < this.length; i++) {
    if (callback(this[i], i, this)) newArray.push(this[i]);
  }
  return newArray;
};

// Test case
const s = [23, 65, 98, 5];
const odd_s = s.myFilter(item => item % 2 === 1);