Multiplesof3or5

Multiplesof3or5.js

function solution(maxN){
  let numbers=[3,5];
  let passingNs = [];
  let ret = 0;
  for (let i = 1; i < maxN; i++) {
    numbers.forEach(n => {
      if (i * n < maxN && passingNs.indexOf((i*n)) === -1) {
        passingNs.push(i*n);
      }
    });
  } 
  passingNs.forEach(n => {
      ret = ret + n;
  });
     
  return ret;
}

// tests
function test(n, expected) {
  let actual = solution(n)
  Test.assertEquals(actual, expected, `Expected ${expected}, got ${actual}`)
}

Test.describe("basic tests", function(){
  test(10,23)
  test(20,78)
  test(200,9168)
})

Test.describe("smallest cases", function() {
  test(-1,0)
  test(0,0)
  test(1,0)
  test(2,0)
  test(3,0)
  test(4,3)
  test(5,3)
  test(6,8)
})

function _solution(number){
  var sum = 0;
  
  for(var i = 1; i< number; i++){
    if(i % 3 == 0 || i % 5 == 0){
      sum += i
    }
  }
  return sum;
}

Test.describe("random cases", function() {
  for(var i = 0; i < 10; i++) {
    let rand = Math.floor(Math.random() * 200)
    test(rand, _solution(rand));
  }
})

Thank you. I was writing the code leaving out **function _solution(number){ };