Project Euler - Problem 1: Multiples of 3 and 5

Tell us what’s happening:
Apparently I only fail at one test (number = 1000) with my code. Does anybody see why? The result is also off by 1000…
Your code so far

function multiplesOf3and5(number) {
  let i = 1;
  let sum = 0;
    if(i%3 == 0 || i%5 == 0){
      sum = sum + i

  return sum;


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Challenge: Project Euler - Problem 1: Multiples of 3 and 5

Link to the challenge:

“Find the sum of all the multiples of 3 or 5 below the provided parameter value number.”

I have bolded the word in the instructions you should pay attention to.

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