Custom-FizzBuzz-Array.js

/*
  Write a function that returns a (custom) FizzBuzz sequence of the numbers 1 to 100.

  The function should be able to take up to 4 arguments:

  The 1st and 2nd arguments are strings, "Fizz" and "Buzz" by default;
  The 3rd and 4th arguments are integers, 3 and 5 by default.
  Thus, when the function is called without arguments, it will return the classic FizzBuzz sequence up to 100:

  [ 1, 2, "Fizz", 4, "Buzz", "Fizz", 7, ... 14, "FizzBuzz", 16, 17, ... 98, "Fizz", "Buzz" ]
  When the function is called with (up to 4) arguments, it should return a custom FizzBuzz sequence, for example:

  ('Hey', 'There')      -->  [ 1, 2, "Hey", 4, "There", "Hey", ... ]
  ('Foo', 'Bar', 2, 3)  -->  [ 1, "Foo", "Bar", "Foo", 5, "FooBar", 7, ... ]
  Examples
  fizzBuzzCustom()[15]                         // returns 16
  fizzBuzzCustom()[44]                         // returns "FizzBuzz" (45 is divisible by 3 and 5)
  fizzBuzzCustom('Hey', 'There')[25]         // returns 26
  fizzBuzzCustom('Hey', 'There')[11]         // returns "Hey" (12 is divisible by 3)
  fizzBuzzCustom("What's ", "up?", 3, 7)[80] // returns "What's " (81 is divisible by 3)
*/

// Answer:

var fizzBuzzCustom = function(stringOne = "Fizz", stringTwo = "Buzz", numOne = 3, numTwo = 5) {
  let result = [];
  for (let i = 1; i <= 100; i++) {
    if (i % (numOne * numTwo) === 0) result.push(stringOne + stringTwo)
    else if (i % numOne === 0) result.push(stringOne)
    else if (i % numTwo === 0) result.push(stringTwo)
    else result.push(i)
  }
  return result;
};

// BigO: O(1)