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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d_d (1)

There's no need to reference the object or method name within your double function:

double: function (numX) {
  return numX * 2

If you wanted to use double, you could do so like this: console.log(mathHelpers.double(5))

So it looks like you mixed up defining a method and calling that method.


Hey man, thanks for your help, but it didn't work. I knew it wouldn't work because that's what I did the first attempt at the assignment. @d_d