Functional Programming - Implement map on a Prototype

JavaScript
1

Tell us what’s happening:

Array.prototype.myMap = function(callback) {
const newArray = ;
// Only change code below this line
newArray = this.slice(0);
const newArray2 = ;
for(let i = 0; i < newArray.length; i++){
newArray2.push(callback(newArray[i], i, newArray));
}

console.log(newArray2.length)
// Only change code above this line
return newArray2;
};

why is my code not working? Also, how am I supposed to know how the callback function works and what arguments it needs?

Your code so far

Array.prototype.myMap = function(callback) {
  const newArray = [];
  // Only change code below this line
  newArray = this.slice(0);
  const newArray2 = [];
  for(let i = 0; i < newArray.length; i++){
    newArray2.push(callback(newArray[i], i, newArray));
  }

  console.log(newArray2.length)
  // Only change code above this line
  return newArray2;
};

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User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Challenge Information:

Functional Programming - Implement map on a Prototype

2

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