/*
Description:
Create a function taking a positive integer as its parameter and returning a string containing the Roman Numeral representation of that integer.

Modern Roman numerals are written by expressing each digit separately starting with the left most digit and skipping any digit with a value of zero. In Roman numerals 1990 is rendered: 1000=M, 900=CM, 90=XC; resulting in MCMXC. 2008 is written as 2000=MM, 8=VIII; or MMVIII. 1666 uses each Roman symbol in descending order: MDCLXVI.

Example:

solution(1000); // should return 'M'
Help:

Symbol    Value
I          1
V          5
X          10
L          50
C          100
D          500
M          1,000
Remember that there can't be more than 3 identical symbols in a row.

More about roman numerals - http://en.wikipedia.org/wiki/Roman_numerals
*/

function solution(number) {
  var result = "",
    decimals = [1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1],
    roman = [
      "M",
      "CM",
      "D",
      "CD",
      "C",
      "XC",
      "L",
      "XL",
      "X",
      "IX",
      "V",
      "IV",
      "I"
    ];

  decimals.map(function(value, index) {
    while (number >= value) {
      result += roman[index];
      number -= value;
    }
  });

  return result;
}
