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github.com/jackocnr/intl-tel-input/wiki/Convertin…

Convert jQuery to JavaScript

jQuery already is JavaScript. Do you mean Vanilla JavaScript? If so, here you go:

1. Vanilla JS has no siblings() function, so we have to implement it
2. Vanilla JS has no toggle() function, so we have to implement it
3. I will also make the line more readable by not stuffing everything into a single line
4. I will try to use modern JS. You can downgrade it if you really need it, though there are great build tools and you actually should use modern JS
5. Keep in mind that using selectors, you might not need siblings() - which would reduce the Vanilla JS code by 50% LoC
6. By using a proper class to show an element, toggling might be reduced to element.classList.toggle("show")

const getSiblings = function(element, selector) {
  // setup siblings array and get the first sibling
  const siblings = [];
  let sibling = element.parentNode.firstChild;

  // loop through each sibling and push to the array
  while (sibling) {
    if (sibling.nodeType === 1 && sibling !== element && sibling.matches(selector)) {
      siblings.push(sibling);
    }

    sibling = sibling.nextSibling
  }

  return siblings;
};
// unfortunately, I don't know the element type, which would have been great
// replaces $(".plus")
const plusElement = document.querySelector(".plus");
const toggleDisplayStyle = function(elements) {
  // loop over all elements
  for (const element of elements) {
    // and toggle the display style property
    element.style.display = element.style.display === "none" ? "block" : "none";
  }
};

// Add an event handler to the element
// replaces .click()
plusElement.addEventListener("click", event => {
  // replaces $(this).toggleClass("minus")
  plusElement.classList.toggle("minus");
  // replaces .siblings("ul").toggle()
  toggleDisplayStyle(getSiblings(plusElement, "ul"));
});