Roman numerals/Decode: Difference between revisions

====Declarative====

<syntaxhighlight lang="javascript">

(() => {

function toNumeric(value) {

return value

.replace(/IV/, 'I'.repeat(4))

.replace(/V/g, 'I'.repeat(5))

.replace(/IX/, 'I'.repeat(9))

.replace(/XC/, 'I'.repeat(90))

.replace(/XL/, 'I'.repeat(40))

.replace(/X/g, 'I'.repeat(10))

.replace(/L/, 'I'.repeat(50))

.replace(/CD/, 'I'.repeat(400))

.replace(/CM/, 'I'.repeat(900))

.replace(/C/g, 'I'.repeat(100))

.replace(/D/g, 'I'.repeat(500))

.replace(/M/g, 'I'.repeat(1000))

.length;

}

const numerics = ["MMXVI", "MCMXC", "MMVIII", "MM", "MDCLXVI"]

.map(toNumeric);

console.log(numerics);

})();

</syntaxhighlight>

{{Out}}

<pre>

[2016, 1990, 2008, 2000, 1666]

</pre>