Clean up and simplify our hexToBinary method

js/script.js

@@ -467,40 +467,13 @@ function updateString(fieldName) {
 
 // Convert hex to binary
 function hexToBinary(s) {
-  let i;
   let ret = '';
-  // lookup table for easier conversion. "0" characters are padded for "1" to "7"
-  const lookupTable = {
-    0: '0000',
-    1: '0001',
-    2: '0010',
-    3: '0011',
-    4: '0100',
-    5: '0101',
-    6: '0110',
-    7: '0111',
-    8: '1000',
-    9: '1001',
-    a: '1010',
-    b: '1011',
-    c: '1100',
-    d: '1101',
-    e: '1110',
-    f: '1111',
-    A: '1010',
-    B: '1011',
-    C: '1100',
-    D: '1101',
-    E: '1110',
-    F: '1111',
-  };
-  for (i = 0; i < s.length; i += 1) {
-    // eslint-disable-next-line no-prototype-builtins
-    if (lookupTable.hasOwnProperty(s[i])) {
-      ret += lookupTable[s[i]];
-    } else {
+  for (let i = 0; i < s.length; i += 1) {
+    const nibble = parseInt(s[i], 16);
+    if (Number.isNaN(nibble)) {
       return { valid: false, s };
     }
+    ret += nibble.toString(2).padStart(4, '0');
   }
   return { valid: true, result: ret };
 }