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  <title>Roman Numerals Encoder</title>
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<body>
Create a function taking a positive integer as its parameter and returning a string containing the Roman Numeral representation of that integer.
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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.
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Example:
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solution(1000); // should return 'M'
Help:
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Symbol    Value
I          1<br/>
V          5<br/>
X          10<br/>
L          50<br/>
C          100<br/>
D          500<br/>
M          1,000<br/>
Remember that there can't be more than 3 identical symbols in a row.
<script id="jsbin-javascript">
function solution(number){
  if (!+number)
        return NaN;
    var digits = String(+number).split(""),
        key = ["","C","CC","CCC","CD","D","DC","DCC","DCCC","CM",
               "","X","XX","XXX","XL","L","LX","LXX","LXXX","XC",
               "","I","II","III","IV","V","VI","VII","VIII","IX"],
        roman = "",
        i = 3;
    while (i--)
        roman = (key[+digits.pop() + (i * 10)] || "") + roman;
        console.log( Array(+digits.join("") + 1).join("M") + roman);

    return Array(+digits.join("") + 1).join("M") + roman;
}
</script>


<script id="jsbin-source-javascript" type="text/javascript">function solution(number){
  if (!+number)
        return NaN;
    var digits = String(+number).split(""),
        key = ["","C","CC","CCC","CD","D","DC","DCC","DCCC","CM",
               "","X","XX","XXX","XL","L","LX","LXX","LXXX","XC",
               "","I","II","III","IV","V","VI","VII","VIII","IX"],
        roman = "",
        i = 3;
    while (i--)
        roman = (key[+digits.pop() + (i * 10)] || "") + roman;
        console.log( Array(+digits.join("") + 1).join("M") + roman);

    return Array(+digits.join("") + 1).join("M") + roman;
}
</script></body>
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