JS Challenge validation issue : Use the reduce Method to Analyze Data

[courteaud.john]

Tell us what’s happening:
When validating the challenge, it prints error : Your code should use the reduce method.

Your code so far

function getRating(watchList){
  // Only change code below this line
  const averageRating = watchList.filter((titre) => titre["Director"] == "Christopher Nolan")
  .map((titre) => Number(titre["imdbRating"]))
  .reduce((sum, rank) => sum + rank)
  /
  watchList.filter((titre) => titre["Director"] == "Christopher Nolan")
  .length;


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

NOTE : same error occurs using copy/paste from “Get Hint” solutions 1. The 2nd & 3th works nice.

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:88.0) Gecko/20100101 Firefox/88.0.

Challenge: Use the reduce Method to Analyze Data

Link to the challenge:

freeCodeCamp.org

[Dorfieeee]

So what exactly do you need to help with?
I think you’re supposed to use only and only reduce method not others as filter and map

[sanity]

There’s an error affecting this challenge, to make it pass just put all chained methods (.reduce, .map, etc.) on the same line after the watchList.

For more information see: Bug with challenge: Use the filter Method to Extract Data from an Array · Issue #41951 · freeCodeCamp/freeCodeCamp · GitHub

[courteaud.john]

Thank both of you for the quick answers.
I should have checked first on GitHub before posting on the forum for “help”.
Have a nice day & happy coding

[Dorfieeee]

SPOILER ALERT
Solution using only reduce method:

function getRating(watchList){
  // Only change code below this line
  var averageRating;
  averageRating = watchList.reduce((ratings, movie) => {
      if (movie["Director"] === "Christopher Nolan") {
        return ratings.concat(Number(movie["imdbRating"]));
      }
      return ratings
    }, [])
    .reduce((average, rating, i, arr) => {
      if (i === arr.length - 1) {
        return (average + rating) / arr.length;
      }
      return average + rating; 
    });
  // Only change code above this line
  return averageRating;
}