Build an Optional Arguments Sum Function - Build an Optional Arguments Sum Function

JavaScript
1

Tell us what’s happening:

i need help here i can’t pass the test #5 it return a function and it require to return undefined , anyhelp here :upside_down_face:

Your code so far

function addTogether(arg1, arg2 = null) {

  if(typeof arg1 == 'number') {
    if(typeof arg2 == 'number') {
      return arg1 + arg2
    }
    if(arg2 == undefined) {
      return function(x) {
        if(typeof x == 'number') {
          return arg1 + x
        }
      }
    }
  }


}

console.log(addTogether(2)(5))
console.log(addTogether(5))
console.log(addTogether(5, undefined))

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36

Challenge Information:

Build an Optional Arguments Sum Function - Build an Optional Arguments Sum Function

2

you need to change your approach

add console.log({arg1, arg2}) and see what comes out of it

you can’t distinguish between addTogether(5) and addTogether(5, undefined) with your approach

you may want to go back to the last theory block before this lab

3

wait but why i should log arg1, arg2 in an object ??

4

it’s an habit I have, it adds the variable name automatically so I don’t need to label the log

the thing is you should see arg2: null for both cases

1 Like
5

ok i still didn’t get it , i will review the theory you refer to then i may understand

6

this was pointing out an issue with your correct approach, now you need to find the correct approach, that theory block can be your starting point

7

i feel i started to smell the solution , the key is arguments object

8

first look at the second lesson, arguments is a bit outdated, the thing in the second lesson is more modern

1 Like
9

yes i had knowledge about rest parameters but i still donno how to use it with this issue , limme check

10

what’s the main difference between when you should return a function, and when not?

11

the main difference is the undefined if it’s a real value or it’s for undeclared argument

12

i feel something ?
if i tested the length for rest param and i get the length is only 1 i should return function if the length is more than 1 i return undefined value ?
am i true ?

13

so silence means acceptance :slight_smile:
i work on it for now

14

or silence means “I have not read your message yet”

try it, see what happens

1 Like
15

sorry but, i like your way man :slight_smile:

16

please don’t call me man

17

iam so sorry for that too . i just feel exciting somehow , although i did not solved the problem still

18

i started to get despair somehow , i tried and tried , i restarted and commented and did more than brain storming :frowning:

19

Hi if you didn’t see the solution i can give your a hint use destruction args like this addTogether(...args) after do this change your approach . Sorry my english is not very good if you don’t understand send me a message

20

yes i know destructuring , let me try to do it myself first if i failed i will back to you again :slight_smile:

1 Like