Merge branch 'jonathangomz-patch-2'

Conversions/RomanToDecimal.js

@@ -0,0 +1,38 @@
+var values = {
+  I: 1,
+  V: 5,
+  X: 10,
+  L: 50,
+  C: 100,
+  D: 500,
+  M: 1000
+}
+
+function romanToDecimal (romanNumber) {
+  let prev = ' '
+
+  let sum = 0
+
+  let newPrev = 0
+  for (let i = romanNumber.length - 1; i >= 0; i--) {
+    const c = romanNumber.charAt(i)
+
+    if (prev !== ' ') {
+      newPrev = values[prev] > newPrev ? values[prev] : newPrev
+    }
+
+    const currentNum = values[c]
+    if (currentNum >= newPrev) {
+      sum += currentNum
+    } else {
+      sum -= currentNum
+    }
+
+    prev = c
+  }
+  return sum
+}
+
+console.log(romanToDecimal('XXIIVV'))
+console.log(romanToDecimal('MDCCCIV'))
+console.log(romanToDecimal('XXIVI'))