Show an animated ripple effect in your console.

showRainbow.js

var timer;
var cycle = " ░▒▓█▓▒░";

function showRainbow() {
    var offset = 0; 
    var css = "font-family:'Arial Black'; font-size: 32px; color: red;";
    clearInterval(timer);
    timer = setInterval(
    function () {
      console.clear();
      // console.log(timer);
      offset++;
      
      var output = "";
      var l = 45;
      for (var i = 0; i < l; i++) {
          if (i % (cycle.length+1) == 0) {
              output += "\n";
          }
          var char = (offset + i) % cycle.length;
          output += cycle.substr(char, 1);
          
      }
      console.log("%c" + output , css);
    }
    , 60);
}
showRainbow();