Functional Programming - Implement the filter Method on a Prototype

JavaScript
1

Tell us what’s happening:
Regarding the solution, I wanted to ask why we loop through (this[i], i, this).
Why isn’t it just this[i]?

Your code so far

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

Your browser information:

User Agent is: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36

Challenge: Functional Programming - Implement the filter Method on a Prototype

Link to the challenge:

2

Hi there and welcome to the forum!

I have spoilered this solution as we try to avoid solutions being posted on the forum.
Have you tried solving this for yourself yet?

3

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