Readable ES style

Use a consistent, readable JavaScript style that favors early exits, standard APIs, and lint-safe expressions—without sacrificing clarity.

• Prefer guard clauses: if a branch returns, don’t wrap the rest in else.
• Prefer portable, standard checks: e.g. use Array.isArray(arr) instead of arr instanceof Array.
• Keep expressions readable: don’t hide complex logic in inline assignments; split into clear statements when it improves understanding.
• Use concise expressions (one-liners/implicit returns) only when they remain clear; don’t force “minified” patterns.
• Avoid lint-breaking constructs (e.g., comma-operator debug tricks) and respect the project’s lint rules.
• Always declare variables (const/let) to prevent accidental globals.

Example (guard clause + standard API + clear return):

const last = arr => (Array.isArray(arr) ? arr[arr.length - 1] : undefined);

const goobox = url => {
  const dropbox = /(http(s)*:\/\/)*(www\.)*(dropbox.com)/;
  const drive = /(http(s)*:\/\/)*(www\.)*(drive.google.com\/file\/d\/)/;

  if (url.match(dropbox)) {
    return url.replace(/(http(s)*:\/\/)*(www\.)*/, 'https://dl.');
  }

  if (url.match(drive)) {
    const fileId = url.replace(drive, '').match(/[\w]*\//)[0].replace(/\//, '');
    return `https://drive.google.com/uc?id=${fileId}`;
  }

  return null;
};