Beta: order problem? map(), filter(), and reduce() have not been taught yet ,

Challenge write-higher-order-arrow-functions has an issue. User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36. Please describe how to reproduce this issue, and include links to screenshots if possible.

The challenges with map(), filter(), and reduce(), have not been taught yet, in this order.

const realNumberArray = [4, 5.6, -9.8, 3.14, 42, 6, 8.34];
// change code below this line
var squaredIntegers = realNumberArray;
// change code above this line
// test your code
console.log(squaredIntegers);

[no-stack-dub-sack]

@ooade - I think what @spieg is saying is that at this juncture, with the current order of the challenges, letting alone that many of the other ES6 challenges do not have test cases, is that the concepts for the array methods that are mentioned here have not yet been covered. So far as I can tell, we no longer have basic introductory challenges for filter(), map(), and reduce(). These are now introduced in the functional programming section, but are used in other challenges leading up to that. I think having basic intros to these concepts would be a good idea, earlier on in the curriculum.

[QuincyLarson]

@no-stack-dub-sack this challenge is now live on https://learn.freecodecamp.org - would you be interested in making the fix (moving it, or writing a few quick challenges that introduce these functional JavaScript features prior to the functional programming section?)