Implement the filter Method on a Prototype

Tell us what’s happening:

Your code so far

// the global Array
var s = [23, 65, 98, 5];

Array.prototype.myFilter = function(callback){
  var newArray = [];
  // Add your code below this line
  // Add your code above this line
  return newArray;


var new_s = s.myFilter(function(item){
  return item % 2 === 1;

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User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.87 Safari/537.36.

Link to the challenge:

You’re almost there.

The problem is here:


You are pushing the return value of the callback onto the new array. But that returns a boolean. Is that what you want? An array of booleans? Use that return value to decide if you want to push the value of item onto your new array.


hey man. can you explain what does [docallback(item)] it mean???

Hello, the argument to filter is a function called callback that is applied to each argument of the array

So callback(item) is literally just calling that function

1 Like

thanks for your reply , :grin: