(function() {
  "use strict";
  document.getElementById("demo").innerHTML = "Paragraph changed.";
  function keywordusage(text, keywords) {
    var text = 'Dive Into Python is a free book for experienced programmers';
    var keywords = ['Python', 'python', 'scala'];
    var textNoSpaces = text.split(" ");
    var x = [];
    for(var i in keywords) {
      if (i in textNoSpaces) {
        x.push("true");
      } else{
        x.push("false");
      }
      return x;
    }
  }

})();