How to complete LTNG_SecureFilters_Challenge

I am stuck on the https://trailhead.salesforce.com/modules/security-for-lightning-components/units/secure-your-lightning-java-script-code challenge.
After searching on the internet, I am unable to find a solution. I found a link https://developer.salesforce.com/forums/?id=9060G000000UbhwQAC but I am not sure what solution in it works. (And I found another web page referring this same url saying "Jeff" had found a solution..but it did not work for me. Here is what Jeff first says:
Trying securing the description instead: secureFilters.html(results[i].Description__c)

I tried that and get this message:
Challenge Not yet complete... here's what's wrong:
The 'LTNG_SecureFilters_Challenge' component does not appear to be requiring the secureFilters resource.

Further in the post the person who asked the question says this: "That worked. Thanks."
And then he summarizes and says would this be OK:

secureFilters.html(results)

And Jeff replies, "Correct".

So I tried doing this:
var results = response.getReturnValue() ;
secureFilters.html(results) ;
And this created an error.....
And I tried this (thinking that maybe it needs to be passed to a variable) :
var results = response.getReturnValue() ;
results = secureFilters.html(results) ;
And this created an error.....

Can anyone please help?

Thank you,
Stuart

April 4, 2018
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Best Answer chosen by Stuart Fleming

Stuart Fleming
I guess I will give myself an atta-boy. I found the solution.

1. At the top of the LTNG_SecureFilters_Demo.cmp file was a reference to
<ltng:require scripts="{!$Resource.DemoSecureFilters}" />

I had not added a reference to the "{!$Resource.DemoSecureFilters}" in the LTNG_SecureFilters_Challenge.cmp. So I added this

<ltng:require scripts="{!$Resource.DemoSecureFilters}" />

to the top of the LTNG_SecureFilters_Challenge.cmp.  However, using the DemoSecureFilters in the LTNG_SecureFilters_Challenge.cmp file did not work.

I had already downloaded the github resource and named it securefilters.js, and tried updating the LTNG_SecureFilters_Challenge.cmp. file reference to
<ltng:require scripts="{!$Resource.securefilters}" />

This passed the challenge

So the solution is:
1. download the github js library (mentioned in the trailhead). as a static resource. Name it securefilters.js
2. Update the LTNG_SecureFilters_Challenge.cmp to reference javascript library
<ltng:require scripts="{!$Resource.securefilters}" />
3. Change the results[i].Description__c to
  secureFilters.html(results[i].Description__c )