fix: standard style issues

Conversions/BinaryToHex.js

@@ -1,5 +1,5 @@
 const pad = (num, padlen) => {
-  var pad = new Array(1 + padlen).join(0)
+  const pad = new Array(1 + padlen).join(0)
   return (pad + num).slice(-pad.length)
 }
 

Conversions/DecimalToRoman.js

@@ -40,7 +40,7 @@ const orders = [
 
 function decimalToRoman (num) {
   let roman = ''
-  for (var symbol of orders) {
+  for (const symbol of orders) {
     while (num >= values[symbol]) {
       roman += symbol
       num -= values[symbol]

Conversions/HexToDecimal.js

@@ -1,18 +1,16 @@
 function hexToInt (hexNum) {
   const numArr = hexNum.split('') // converts number to array
-  numArr.map((item, index) => {
-    if (!(item > 0)) {
-      switch (item) {
-        case 'A': return (numArr[index] = 10)
-        case 'B': return (numArr[index] = 11)
-        case 'C': return (numArr[index] = 12)
-        case 'D': return (numArr[index] = 13)
-        case 'E': return (numArr[index] = 14)
-        case 'F': return (numArr[index] = 15)
-      }
-    } else numArr[index] = parseInt(item)
+  return numArr.map((item, index) => {
+    switch (item) {
+      case 'A': return 10
+      case 'B': return 11
+      case 'C': return 12
+      case 'D': return 13
+      case 'E': return 14
+      case 'F': return 15
+      default: return parseInt(item)
+    }
   })
-  return numArr // returns an array only with integer numbers
 }
 
 function hexToDecimal (hexNum) {
@@ -23,9 +21,3 @@ function hexToDecimal (hexNum) {
 }
 
 export { hexToInt, hexToDecimal }
-
-// > hexToDecimal('5DE9A'))
-// 384666
-
-// > hexToDecimal('3D'))
-// 61