Review JavaScript Fundamentals by Building a Gradebook App - Step 1

JavaScript
1

Tell us what’s happening:

Building a Gradebook App 1

let sum=0;
function getAverage (scores){
// brings up the scores so i could see them
console.log(scores);
console.log(scores.length);
//then i did a for loop
for(let i = 0 ; i < scores.length; i++){
//get scores total
sum = sum + scores[i];
}
console.log(sum/scores.length);
}
If i comment out one of the two score arrays i can log out just fine.
But if i don’t comment out one , the sum keeps summing up all the grades in both score arrays.

Your code so far


// User Editable Region

 let sum=0;
function getAverage(scores) {
console.log(scores);
  for(let i=0;i < scores.length;i++){
    sum= sum + scores[i];
    
    
  }
  
  console.log("The average for this scores array"+" "+ sum/scores.length);
  
}
  

console.log(getAverage([92, 88, 12, 77, 57, 100, 67, 38, 97, 89]));
//console.log(getAverage([45, 87, 98, 100, 86, 94, 67, 88, 94, 95]));

// User Editable Region

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User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36 Edg/128.0.0.0

Challenge Information:

Review JavaScript Fundamentals by Building a Gradebook App - Step 1

2

don’t write the sum variable in the global scope.
Move it inside the function so it can be reset each time someone calls the function.

Also don’t forget to return something.

1 Like
3

Thank you . I have been working on this for days i even put a if statement to set the sum to 0 if i= scores.length-1

1 Like
4

probably that didn’t work? The variable i gets reset each time the loop code is encountered for the first time. (each function call)

1 Like
5

no i could set sum to 0 but i just couldn’t get the output to log correctly
loged out the first ave and the second below the second score area.
any how . moving the let sum= 0 did rest the sum now i will try to use a return to log out the scores correctly. Thanks again.

6

Thanks all is good .

7

What am i doing wrong here?
let scores = ;
function getAverage(scores) {
let sum = 0;
let average = 0;
for (let i = 0; i <= scores.lenght; i++){
sum = sum + scores[i];
}
average = sum / scores.lenght;
return average
}
console.log(getAverage([92, 88, 12, 77, 57, 100, 67, 38, 97, 89]));
console.log(getAverage([45, 87, 98, 100, 86, 94, 67, 88, 94, 95]));

it keep returning NaN as a result

8

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