So, on my website, i have 8 title strings, and i want to give for each one type write effect by scrolling (only one time).

I have already written some code to detect only title that i need by scrolling, so by scrolling, i start typeWriteEffect function with param string (so i only get title that i want to animate):

let titleStrings = [];

function typeWriteEffect(string) {
    if (!titleStrings.includes(string)) {
      titleStrings.push(string);
    }
    console.log(titleStrings);
  }

And now one question, how is it better to give effect for each title only once?