Uncategorized - Caesar Cipher

UncategorizedCaesar Cipher

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code.js

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// import visualization libraries {...}
const string = 'hello! how are you doing?';
const rotation = 5;
const alphabet = 'abcdefghijklmnopqrstuvwxyz';
// create a map of char -> position to improve run time
// otherwise we would have to search the alphabet each
// time to find the character position
const alphabetMap = alphabet.split('').reduce((map, curr, idx) => {
  map[curr] = idx;
  return map;
}, {});
// define tracer variables {...}
function getPosUp(pos) {
  return (pos === alphabet.length - 1) ? 0 : pos + 1;
}
function getPosDown(pos) {
  return (pos === 0) ? alphabet.length - 1 : pos - 1;
}
function getNextChar(currChar, direction) {
  const pos = alphabetMap[currChar];
  const nextPos = direction === 'up' ? getPosUp(pos) : getPosDown(pos);
  const nextChar = alphabet.charAt(nextPos);
  // logger {...}
  return nextChar;
}
function cipher(str, rotation, direction, cipherTracer) {
  if (!str) return '';
  for (let i = 0; i < str.length; i++) {
    // visualize {...}
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