Cool Javascripts to reuse

useful.js

// Download file
export function downloadFile(url, filename) {
  const a = document.createElement("a");
  a.href = url;
  a.download = filename;
  document.body.appendChild(a);
  a.click();
  document.body.removeChild(a);
}
// Example: downloadFile("/resume.pdf", "MyResume.pdf");

// Remove dupes from an array
export function uniqueArray(arr) {
  return [...new Set(arr)];
}

// Copy to clipboard
export async function copyToClipboard(text) {
  try {
    await navigator.clipboard.writeText(text);
    return true;
  } catch (err) {
    console.error("Copy failed:", err);
    return false;
  }
}
// Example: <button onClick={() => copyToClipboard(url)}>Copy</button>

// Is object empty?
export function isEmpty(obj) {
  return obj && Object.keys(obj).length === 0 && obj.constructor === Object;
}

// Pretty date
export function formatDate(dateStr) {
  return new Date(dateStr).toLocaleDateString("en-US", {
    year: "numeric",
    month: "short",
    day: "numeric",
  });
}