Basic JavaScript - Understanding Undefined Value returned from a Function

JavaScript
1

says sum has to equal 8 for both functions, what am i doing wrong here

// Setup
let sum = 0;


function addThree() {
   sum = sum + 3;
}

 function addFive() {
   sum += 5;
 }

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Challenge: Basic JavaScript - Understanding Undefined Value returned from a Function

Link to the challenge:

2

Try to restart this exercise and then before you code, read the comments in the code section. They are telling you to write your code in a specific area without touching any of the existing code.

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