Create roman-numerals-converter.js

akastoras · web-flow · commit c6071a13140b · 2020-10-01T00:54:59.000+03:00
diff --git a/roman-numerals-converter/roman-numerals-converter.js b/roman-numerals-converter/roman-numerals-converter.js
@@ -0,0 +1,101 @@
+const ROMANNUMERALS = {
+  "1": "I",
+  "5": "V",
+  "10": "X",
+  "50": "L",
+  "100": "C",
+  "500": "D",
+  "1000": "M"
+}
+
+var converters = [
+  function(num) {
+    if (num =="9") {
+      return ROMANNUMERALS[1]
+    } else if (num >= 5) {
+      let str = ROMANNUMERALS[5]
+
+      for (let i = 5; i < num; i++) {
+        str += ROMANNUMERALS[1]
+      }
+      return str
+    } else if (num == "4") {
+      return "IV"
+    } else {
+      let str = ""
+
+      for (let i = 0; i < num; i++) {
+        str += ROMANNUMERALS[1]
+      }
+      return str
+    }
+  },
+  function(num) {
+    if (num =="9") {
+      return ROMANNUMERALS[10]
+    } else if (num >= 5) {
+      let str = ROMANNUMERALS[50]
+
+      for (let i = 5; i < num; i++) {
+        str += ROMANNUMERALS[10]
+      }
+      return str
+    } else if (num == "4") {
+      return "XL"
+    } else {
+      let str = ""
+
+      for (let i = 0; i < num; i++) {
+        str += ROMANNUMERALS[10]
+      }
+      return str
+    }
+  },
+  function(num) {
+    if (num =="9") {
+      return ROMANNUMERALS[100]
+    } else if (num >= 5) {
+      let str = ROMANNUMERALS[500]
+
+      for (let i = 5; i < num; i++) {
+        str += ROMANNUMERALS[100]
+      }
+      return str
+    } else if (num == "4") {
+      return "CD"
+    } else {
+      let str = ""
+
+      for (let i = 0; i < num; i++) {
+        str += ROMANNUMERALS[100]
+      }
+      return str
+    }
+  },
+  function(num) {
+    let str = ""
+
+    for (let i = 0; i < num; i++) {
+      str += ROMANNUMERALS[1000]
+    }
+    return str
+  }
+]
+
+function convertToRoman(num) {
+  var str = num.toString().split("")
+
+  num = []
+  for (let i = 0; i < str.length; i++) {
+    if (str[i] == "9") {
+      let cluster = []
+      cluster.push(converters[str.length - i](1))
+      cluster.unshift(converters[str.length - i - 1](9))
+      num = num.concat(cluster)
+    } else {
+      num.push(converters[str.length - i - 1](str[i]))
+    }
+  }
+
+  return num.join("")
+}
