# Intermediate Algorithm Scripting - Sum All Odd Fibonacci Numbers

Could use some help making this code work. I can’t understand why it doesn’t but feel like I made the same mistakes as last time.

``````function sumFibs(num) {
let arr=[]
for(let i=1;i<=num;i+=i)
arr.push(i)
for(let j=2;j<=arr.length;j+=2)
arr.splice(j);
(arr) => {
return arr.reduce((total, current) => {
}, 0);

}
return arr

}
sumFibs(4)

``````

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Challenge: Intermediate Algorithm Scripting - Sum All Odd Fibonacci Numbers

``````function sumFibs(num) {
let arr = [];
for (let i = 1; i <= num; i += i) {
arr.push(i);
}
for (let j = 2; j <= arr.length; j += 2) {
arr.splice(j);
}
(arr) => {
return arr.reduce((total, current) => {
}, 0);
}
return arr;
}
sumFibs(4)
``````

Can you explain what this code is supposed to do? Not what the literal syntax means, but why?

Side note - if you aren’t sure exactly how to use fancy syntax, you can stick to only for loops, while loops, and if statements. That will solve 99% of the challenges without any splice or reduce.

The first for loop is meant to loop in the Fibonacci sequence of all integers before and including ‘num’, by adding i to its self. I then put them into an array. The second for loop is meant to loop through all the even numbers before and including num, so that then I could remove them from the array by using splice. Then the reduce function is meant to find the sum of all the numbers in the array, and return it.

So a few issues

1. The first loop isn’t generating any Fibonacci numbers. It’s making every single integer.

2. Splice still creates confusing results so it shouldn’t be used in a loop. Also, you aren’t splicing out every other number. Also, it isn’t the case that every other Fibonacci number is even.

3. I don’t think your reduce is running.

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