What is the parameters in arroy function?

[Den356]

Hello everyone,

please help the newbie figure it out.

There is such a JS code.

function makeDouble (x) {

return x * 2; }

var doMath = (x, func) => func(x + 5);
var num = 5;

The task is this:
Using only makeDouble, doMath, and num, make the value of num equal to 20.

num = _____________________________________________________

I can’t understand why there are two parameters in the arrow function, but in the body of this function itself there is only one parameter. What am I doing wrong?

[Ingolme]

The variable "func" is being used as a function in the body.