I would like to add attribute "aria-label=test1" when it is fa-chevron-left and "aria-label=test2" on fa-chevron-right.

"aria-label=test1" should be there on load (default). Could anyone show me how to code it for here?

function s(e) {
  const t = n(),
    c = document.querySelector(".nav-container"),
    o = document.querySelector(".content-container"),
    s = document.querySelector(".slide-btn i.fas");
  switch (e) {
    case "toggle":
      c.classList.toggle("slided"),
        s.classList.toggle("fa-chevron-right"),
        s.classList.toggle("fa-chevron-left"),
        t && o.classList.toggle("slided");
      break;
    case "show":
      c.classList.remove("slided"),
        s.classList.remove("fa-chevron-right"),
        s.classList.add("fa-chevron-left"),
        t && o.classList.add("slided");
      break;
    case "hide":
      if (c.classList.add("slided"), s.classList.add("fa-chevron-right"), s.classList.remove("fa-chevron-left"), t) {
        o.classList.remove("slided");
        const e = document.querySelector(".body-container").getAttribute("activeTopic");
        document.getElementById(e).scrollIntoView()
      }
  }
}