Question

I just started learning js from EloquentJavascript
I need 2 answers to help me pass this example:

function makeAddFunction(amount) {
  function add(number) {
    return number + amount;
  }
  return add;
}

var addTwo = makeAddFunction(2);
var addFive = makeAddFunction(5);
show(addTwo(1) + addFive(1));

Question 1:

Can we just add () after variable meaning to add argument to the function that the variable represent? like addTwo(1) means makeAddFunction(1)?

Question 2:

makeAddFunction(2) means amount = 2, then what’s the value for number? If I pick a section of the above example, what will return in the following section?

function makeAddFunction(2) {
  function add(number) {
    return number + 2;
  }
  return add;
}

Answer 1

Can we just add () after variable meaning to add argument to the function that the variable represent? like addTwo(1) means makeAddFunction(1)

Nope. addTwo(1) equals to makeAddFunction(2)(1)

makeAddFunction(2) means amount = 2, then what’s the value for number? in the following example2, what will return?

You pass it additionally, when call addTwo or addFive