Need help with assignment 12: Lambda

In assignment 12 of the precourse, I'm asked to demonstrate the proper use of methods in the javascript language. The lesson in accordance to this assignment also covers loops and .this. I'm not sure if I have to demonstrate those for exercise one, but we'll see.

Anyways, I'm already given an object called mathHelpers. I have to create a method within the object and call it 'double'. The double method must take one parameter, a number and the number must be returned with a multiple of 2.

Problem: I don't know if I'm overthinking it or what, but everything I try doesn't seem to work. I keep getting the unidentified error after declaring the method as a function and writing the code within.


function exerciseOne(){

  let mathHelpers = {
double : function (numX) {

return mathHelpers.double(5) * 2;

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mwilki7 (1113)

What do they errors say?