Write Higher Order Arrow Functions (Stuck!)

JavaScript
1

Tell us what’s happening:
I sort of understand what I need to do, conceptually, to get through this problem. But, I am not sure how to accomplish it in practice. The task I am failing is " squaredIntegers should be [16, 1764, 36]". Any help on how to approach this problem, without being given the direct answer, would be great. Thanks, in advance!

Your code so far


const realNumberArray = [4, 5.6, -9.8, 3.14, 42, 6, 8.34, -2];
const squareList = (arr) => {
  "use strict";
  // change code below this line
  const squaredIntegers = realNumberArray
  .filter(realNumberArray => realNumberArray.isInteger === true)
  .map(realNumberArray => Math.sqrt(squaredIntegers));
  // change code above this line
  return squaredIntegers;
};
// test your code
const squaredIntegers = squareList(realNumberArray);
console.log(squaredIntegers);

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.131 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/es6/write-higher-order-arrow-functions

2

Check the documentation of how Number.isInteger is used.

You got the right idea, unfortunately the syntax is “a bit off”, making your filter function eliminating all the values :slight_smile:

Hope this helps :+1:

3

You may want to avoid using the name of an existing variable for the parameters inside the callback functions, it seems unnecessary confusing

4

Yes it, definitely did! Changed my syntax and it helped me find out the answer. Thank you!

5

Makes sense. Changed it to “arr” instead of the specific variable itself and that helped me see things more clearly. Thanks!

6

well, it is not the whole array, it is an element of the array. Often I see just e or el used as parameter names