<div>
  <i id="icons" class="far fa-heart"></i>
</div>

I don't know why this code doesn't changes the icons as script is linked and the console didn't show any error as well

let icons = document.getElementById("icons");
icons.addEventListener("click", () => {
  icons.classList.remove = "far fa-heart";
  icons.classList.add = "fas fa-heart";
  console.log(icons);
});