Alejandro Lariccia

const CONFIG = {
  colors: ['yellow', 'blue', 'red', 'green'],
  speed: 200
};

function button_selection() {
  let counter = 0;
  
  setInterval(() => {
    $(".color").css("color", CONFIG.colors[counter]);
    
    counter = counter < CONFIG.colors.length ? counter + 1 : 0;
  }, CONFIG.speed);
};

button_selection()

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<h1 class="color">Hello world, I love you all.</h1>