# Learn Form Validation by Building a Calorie Counter - Step 63

### Tell us what’s happening: I am stuck where I need to put the code since I put in after the if statement and after the for statement but its just telling me now. That I have an invalid left-hand side.

Use the addition assignment operator to add `currVal` to your `calories` total. You’ll need to use the `Number` constructor to convert `currVal` to a number.

SyntaxError: unknown: Invalid left-hand side in assignment expression. (47:4)

function getCaloriesFromInputs(list) {
let calories = 0;

for (let i = 0; i < list.length; i++) {
const currVal = cleanInputString(list[i].value);
const invalidInputMatch = isInvalidInput(currVal);

``````if (invalidInputMatch) {
isError = true;
return null;
};
Number(currVal) +=  calories;
``````

}

}
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### Challenge Information:

Learn Form Validation by Building a Calorie Counter - Step 63

In your expression Number(currVal) += calories;
You are adding like this Number(currVal) = Number(currVal) + calories.
Here you are updating the Number(currVal). However, I think what we asked to do here is to update the calories total, not Number(currVal)

Try writing calories on the LHS and Number(currVal) on the RHS.

2 Likes

Thanks for responding I tried that and still not passing

Can you share the snapshot of your final code?

Also, as far as I can see your function does not return anything.

function getCaloriesFromInputs(list) {
Here you have calculated and updated the calories total
But you have not done anything with the final (calories) value.
}

Once this function getCaloriesFromInputs(list) gets called, calories will be calculated, but the final value will be hanging somewhere.

Can you try adding “return calories” after the “if statement”?

function getCaloriesFromInputs(list) {
let calories = 0;

for (let i = 0; i < list.length; i++) {
const currVal = cleanInputString(list[i].value);
const invalidInputMatch = isInvalidInput(currVal);

``````if (invalidInputMatch) {
isError = true;
return null;
};
calories += Number(currVal);
return calories;
``````

}

}

function getCaloriesFromInputs(list) {
some code

``````      for ( ***some code***) {
***some code***
if (***....***) {
***some code***
};                           // if statement ends here
calories += Number(currVal);     //this is the last statement in the for loop
};
return calories;     // this is the last statement in the function
``````

}

1 Like

Please don’t necro old posts. Thanks