This is a Sanity check javascript script to compare values when you think you are going crazy but you just want to confirm

sanityCheck.ts

/**
 * Compare and write where the difference between strings is
 * @param {String} a string to compare
 * @param {String} b string to compare
 * @returns {String} comparison
 */
function compareStrings(a: string, b: string): string {
  if (a.split('').every((c, n) => b.charCodeAt(n) == c.charCodeAt(0))) {
    return `\x1b[32m${a} == ${b}\x1b[0m`;
  }
  const [bigger, smaller] = a.length < b.length ? [b, a] : [a, b];
  const diff = bigger.split('').map((char, idx) => ({
    idx,
    bigger: char,
    smaller: smaller[idx] ?? '\x1b[4m_',
    diff: char.charCodeAt(0) != smaller.charCodeAt(idx),
  }));
  const { acc: biggerDiff } = diff.reduce(
    ({ acc, lastDiff }, { bigger: char, diff }) => {
      const part =
        (lastDiff === diff ? '' : diff ? '\x1b[31m' : '\x1b[32m') + char;
      return {
        acc: `${acc}${part}`,
        lastDiff: diff,
      };
    },
    { acc: '', lastDiff: null } as { acc: string; lastDiff: boolean | null }
  );
  const { acc: smallerDiff } = diff.reduce(
    ({ acc, lastDiff }, { smaller: char, diff }) => {
      const part =
        (lastDiff === diff ? '' : diff ? '\x1b[31m' : '\x1b[32m') + char;
      return {
        acc: `${acc}${part}`,
        lastDiff: diff,
      };
    },
    { acc: '', lastDiff: null } as { acc: string; lastDiff: boolean | null }
  );
  return `${biggerDiff}\x1b[31m !== ${smallerDiff}\x1b[0m`;
}

console.log(compareStrings('Gabriel Rodrigues', 'Gabriel Rodrigues'));
console.log(compareStrings('1234567890', '1234567890'));
console.log(compareStrings('123456789', '8761230897'));
console.log(compareStrings('Gabriel Rodrigues', 'Gabrie1 Rodrigue5'));
console.log(compareStrings('SUPER_LARGE_STRING_HERE', 'tiny'));